Evaluate cos (1 + 2i)

Q: Show that cos (x + 2pie) = cos x

A: To prove  cos (x + 2π) = cos x expand on the formula  Cos (A +B)  = cosA. cosB - sinA. sinB Here A =…

Q: Establish the identity: sin2(-θ)+ cos2(-θ) = 1

A: Here we have to establish the identity,  sin2(-θ)+cos2-θ=1

Q: IT Compute. 271 Cos b Cos Q-1 do

A: Since you have posted multiple questions i can do first question as per our company guidelines…

Q: Evaluate cos(9x)cos(3x)dæ.

A: Given definite integral ∫0πcos(9x)cos(3x)dx compute the difinite integral It is in the form of…

Q: Prove the identity. Cos(x− 90°) − Cos( x + 90°) = 2 sin x

A: We will use the formulas: cos(A-B)=cosAcosB+sinAsinBcos(A+B)=cosAcosB-sinAsinB

Q: Verify the identity: cos2 x - sin2 x = 2 cos2 x - 1

A:

Q: Evaluate exacly cos-1(-√3/2)

A: To evaluate

Q: 7T Determine the exact value of Cos

A:

Q: Evaluate

A: To evaluate, cosπ12

Q: Evaluate cos π/12

A:

Q: 6. Evaluate cos(- ).

A: Givencos-1(-32)

Q: Evaluate ∫cos^2 xdx

A:

Q: Prove the identity step by step.  cos4 x-sin4 x=cos2x

A:

Q: 4. Simplify the identity: cos 2 x - 1 Cos x + 1 COS

A:

Q: Compute the exact value of cos (cos 4). COS COS

A:

Q: Establish the identity cos ²(80) – sin2(80) = cos (160).

A: Given : cos28θ - sin28θ = cos16θ

Q: Use substitution to rewrite 4 cos^2 x=4

A:

Q: Write the value of cos +2sin 2 1 1 -1

A: cos-1-12+2sin-112

Q: 3. In (cos)

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Q: Find cos 0. Type + or - (-12,5) [?] 1... 1. Enter

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Q: Compute the exact value of cos(-5π/8)

A: Given: The trigonometric ratio cos-5π8 To find: The exact value of given trigonometric ratio.

Q: Find the point of intersection of cos(x)=cos^-1(x)

A: We will find the point of intersection using the graph.

Q: Prove the identity: cos4x - sin4x = cos2x

A:

Q: find cos x if cos 2x=1/9

A: Consider the equation

Q: rewrite cos(x-(11pi/6) in terms of cos(x)and sin(x)

A:

Q: Prove that sin x+ cos -1 -1

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Q: Let cos x = 7/8  with x in QIV and find the following. cos 2x

A:

Q: Verify the identity. cos (x+ n) = - c COSX

A: It can be varified using the formula for cos(A+B)

Q: Estimate cos(π/4 - 0.1) + cosπ/4

A: Solving

Q: Prove that there exists a value of x so that COs x COS-1

A: The given data is: cosx=cos-1x To prove that there exists a value of x.

Q: How can I find Cos B

A: The given triangle is:

Q: (7) Determine the exact value of cos 4

A: By trigonometry ratio ,we get

Q: verify that el0 + e-i0 COS %3D

A:

Q: prove cos(n*pi) = (-1)^n

A: To prove: cosnπ=-1n

Q: Evaluate [ (cos² 0 + 2 csc² 0 + sin² 0) do .

A:

Q: Verify the identity cos2 θ/2 = (sin θ + tan θ) /2tan θ

A: sinθ+tanθ2tanθ=sinθ+sinθcosθ2·sinθcosθ=sinθcosθ+sinθ2sinθ=sinθcosθ+12sinθ=cosθ+12=2cos2θ22…

Q: Find the exact value of cos. O undefined 1/2

A:

Q: 1 cos²(x) 2

A: The given question as belonging to the calculus in which we have to find the given integral so now…

Q: Determine an identity for cos 30 in terms of sin 0 and cos 0. 13.

A:

Q: Verify the identity: cos4 t - sin4 t = 1 - 2 sin2 t

A: We have the identity cos4t-sin4t=1-2sin2t   Consider LHS LHS=cos4t-sin4t Rewrite as…

Q: 1+ cos 20 Show that cos 0

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Q: EVALUATE | cos (bx'/) dx

A:

Q: Evaluate cos 1 (2+3i).

A: Given :    cos-12+3i

Q: What are the three formulas for cos 2A?

A: Three formulas for cos 2A are

Q: Find the exact value of cos 4

A: Here we have to find the exact value of;  cos5π4=?

Q: (3) Verify the identity: 1+cos + 1-cose 2csc²x

A:

Q: Prove the identity cos6x + sin6x = 3cos*x- 3cos?x - 1

A: To Determine: prove the identity  Given: we have cos6x+sin6x=3cos4x-3cos2x-1 Explanation: we have an…

Q: Verify the identity. cos (x+n) = - COSX

A: By using trigonometric formula, we verify the given identity

Q: If  cos A= 1/2 with A in QIV, find cos(A/2)

A: