Use reference angles to find the exact value of the expression cos 3π/4. Do not use a calculator.

Q: Which expression is equal to cos(6t)?

A: Recall:  cos(2t)=cos2(t)-sin2(t)     Given,   cos(6t)

Q: Find a cofunction with the same value as the given expression sin 70°

A: We know that sin(x)= cos(90°-x) Here x=70°

Q: Evaluate the expression cos sin 3

A:

Q: Find the exact value of the expression tan [cos -1 (4/5)]. Do not use a calculator.

A: tan [cos -1 (4/5)] We need to find the exact value of the given function.

Q: Use a scientific calculator to approximate in decimal degrees and follow significant figures rules:…

A: Follow next step

Q: Find the exact value. Do not use a calculator. 20 COS 3. 0 1 1/2

A: cosπ3=12cos(2nπ+θ)=cosθcos(π-θ)=cosθ

Q: Use a calculator to find an approximate value (in radians) of the expression rounded to five decimal…

A:

Q: Use your calculator to evaluate cos '(0.47) to at least 3 decimal places. Give the answer in…

A: Here I am attaching image so that you understand each and every step.

Q: If 0s0<360°,then use your calculator and the reference angle to find two values when cos 0 =-0.4568

A:

Q: Evaluate the expression without using a calculator. T - sin. sin cos cos

A:

Q: Use the fact that the trigonometric functions are periodic to find the exact value of each…

A: A periodic function is a function which function's value repeated in regular intervals of their's…

Q: Use a sketch to find the exact value of the expression tan [cos-1 (- 1/3)]

A: Sketch the graph of y=tancos-1x as follows:

Q: find the exact value. Do not use a calculator.

A: cos(7π)

Q: given that cos0=3/5, find sin0 and tan0

A: Given that the cos0=3/5.It known that the cosx=(Adjacent side)/(Hypotenuse).Here, the adjacent side…

Q: Use a calculator to find the value of each expression rounded to two decimal places. cos-10.6

A: To find the value :                       cos-1 (0.6)

Q: Find the exact value in radians. sec (-2) 3. 27t 57

A:

Q: Use a half-angle formula to rewrite the given expression so that it involves the sum or difference…

A: Topic: trigonometry

Q: Find the exact value, without a calculator. 9, 7n sin tan 12 Cos [ ? ] + /[ Enter

A:

Q: If cosθ=0.104, find θ, writing your answer to the nearest degree.

A: Use inverse trigonometry ratio

Q: cos−1(0.33

A: To evaluate using calculator.

Q: Write an algebraic expression that is equivalent to the given expression. sin(arccos(x))

A:

Q: find the exact value of (a) and (b). Do not use calculator. (a) sin(-150°) (b) cos(270°)

A: Find the exact value of: (a) sin-150° (b) cos270°   Here we use the formula:…

Q: Use your calculator to evaluate cos (0.85) to at least 3 decimal places. Give the answer in radians.

A: To use calculator to evaluate cos-10.85 to atleast 3 decimal places.

Q: Find the exact value: (no calculators!) (-) V3 tan 3

A: Use the concept of trigonometric and inverse trigonometric functions.

Q: Provide the value of arccos(sin(14π/13)) without the use of a calculator

A: using cosπ2 - θ = sin(θ)

Q: Evaluate without using a calculator.     cos    -1 ( cos 7pi/4)

A:

Q: If cose=-6 and 0 is in the third quadrant, find the exact value of sin0 13

A:

Q: Find sina.cosa, tan a,csca,seca, and cota cos(2a)= % and 0< 2a <90°

A:

Q: value

A:

Q: Find the exact value of the expression, cos (tan-1 4/3 + cos-1 5/13). Do not use a calculator.

A: Find the exact value of the expression, cos (tan-1 4/3 + cos-1 5/13). Do not use a calculator.

Q: Use reference angles to find the exact value of the following expression. sin 6

A:

Q: Please find the exact value of cos 165 degrees

A: Find the value of cos(165°).

Q: sin

A: Write the expression in terms of sin(π+x).

Q: Evaluate without using a calculator.     cos    -1 ( cos 7pi/6)

A: Given cos-1cos7π6

Q: Find value of cos 30 °

A: Solution is given below:

Q: If 0s0<360°,then use your calculator and the reference angle to find two 0 values when cos 0…

A:

Q: Find the exact value of the expression cos 495°.Do not use a calculator.

A: cos 495° = cos ( 360° + 135° )                 = cos ( 135° )                 = cos ( 90° + 45° )…

Q: Given an acute angle cosx=2/5, use half-angle identity to find the exact value of cos(x/2).

A: Given problem:- Given an acute angle cosx=2/5, use half-angle identity to find the exact value of…

Q: Evaluate without using a calculator. tan(cos−1 9/15)

A:

Q: Find the exact value of the expression cos 240°.Do not use a calculator.

A: It is known that cosx+y=cosxcosy-sinxsiny and cos180∘ =-1, sin180∘ =0, cos60∘ =12, sin60∘ =32.

Q: Evaluate without using a calculator.       tan ( cos  -1 12/13)

A: Let us consider that cosθ=1213 On using a right angled triangle, we value of tanθ as In right…

Q: Find the exact value of the expression cos (sin 13 COS -

A: GIven: - The expression is, cossin-135-cos-112 To find: - The exact value of the given expression.

Q: Use a sketch to find the exact value of the expression.

A: Given expression: tancos-1-13 Consider the value of cos-1-13=y. Therefore, the given expression…

Q: Use your calculator to evaluate cos^-1(0.26) to at least 3 decimal places. Give the answer in…

A: To find the value of

Trigonometric Identities

Trigonometry in mathematics deals with the right-angled triangle’s angles and sides. By trigonometric identities, we mean the identities we use whenever we need to express the various trigonometric functions in terms of an equation.

Inverse Trigonometric Functions

Inverse trigonometric functions are the inverse of normal trigonometric functions. Alternatively denoted as cyclometric or arcus functions, these inverse trigonometric functions exist to counter the basic trigonometric functions, such as sine (sin), cosine (cos), tangent (tan), cotangent (cot), secant (sec), and cosecant (cosec). When trigonometric ratios are calculated, the angular values can be calculated with the help of the inverse trigonometric functions.