23 Select the correct answer. What is the exact value of cos 112.5 ? 2 V2 O B. V2+2 C. V2 + v2 4 O D. V2 + v2 4 O E. - 2-2

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Q: 8. Evaluate Cos(150 deg)= always check if the answer should be positive or negative. -V3 2 Option 4…

A: Given cos(150°) That is equal to cos(90+60) That is cos((π/2)+60) We all know that cos((π/2)+theta)…

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A: Given that,

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Q: 45. Give an example of values a, b such that (a) cos(a + b) + cos a + cos b (b) cos cos a 2.

A: (a)

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A: According to trigonometric formula .

Q: 6) cos K = 27 .K 36 45

A: cos K=adjacenthypotenuse=KZXK=2745=35=0.6

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A: Using definite integral.

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Q: Which of the following expressions correctly determines the value of cos ZA? В 8. A 10 C 82 + 102 +…

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Q: 2) cos Č 34 30 16 B

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Q: Qshow that: Cos 40 8 Cos"e +8 Cos e+1

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Q: 10. Use the formula cos(2a) = 1 – 2 sin? æ to find cos , if sin O v2 2 O v? 2 O_1 2

A: Given that       cos(2x) = 1 - 2sin2(x)  and sin(pi/4)=√2/2 Here we have to find cos(pi/2).

Q: 5. If 270° <0 < 360° and cos 0 = , find cos 20. 225 225 104 225

A: Disclaimer: Since you have asked multiple questions, we will solve the first question for you.  If…

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Q: 2. If 90° <0 < 180° and cos 0 = -, find cos 20. 25 16 25

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Q: ind the exact value of each expression. cos (120° + 45°) b. cos120° + cos45° elect one: (b) V3 1 O…

A: Topic:- coordinate geometry