What is cos75° using the sum or difference identity O A. sin30°sin45° - cos30°cos45° O B. cos30°cos45° - sin30°sin45° O C. sin30°cos45° + cos30°sin45° D. cos30°cos45° + sin30°sin45°

Q: 10. Sec -405 degrees 12. Cot -90 degrees 14. cos 360 degrees  16. sin -225 degrees

A: 10)

Q: 5) Find the exact values. Do not use a calculator. a. cos 60° + tan 45° – sin 30° b. csc- 4 + sin: 2

A:

Q: Determine the Quadrant in which angle O is located if cos < 0 and tan 0 > 0 (please see…

A: The problem is asking us to determine the quadrant in which an angle O is located given that cos(O)…

Q: Find exact value of 2cos15° cos75°

A: We have to find the exact value of , 2cos15° cos75°

Q: Draw 45 0 and 245 0 in standard position and then show that cos (-45 0)  = cos 45 0

A: Consider the given: Draw the 45° angle:

Q: 2) Establish the identity cos(a+B) cos(a-ß) cot acot B-1 cot acot B+1 Show each step to justify your…

A: Solved below

Q: Use a calculator to find 0 to the nearest tenth of the degree, if 0° < 0 < 360° and cos 0 = 0.5150…

A:

Q: If secα= 11/ 3​, then what is cosα

A:

Q: if tan 0=1-a²,Provethatsec0+tan°0cosec0=(2-a²)

A: .Given thattan2θ=1-a2prove thatsecθ+tan3θ cosecθ=(2-a2)32

Q: What are the steps on how to get the exact value of cos 90°?

A:

Q: 9. Determine the correct simplification of the expression (1 + cose)(1- cose).

A: SOLUTION-

Q: What is the reference angle associated with cos 240o ?

A: Answer is- -1/2 Explanation is given below....

Q: there are sin, cos and tan on the calculator keys. Can you tell how can you get the value of tan?

A:

Q: What is the exact value of Cos COS?

A: We have given to find exact value  cosπ3 =12

Q: Change the variables u = 1+y, v = r - y in the integral: L de [ f(z.9) dy assuming that f is…

A: