Ask a New Question

using the trigonometric identities find the exact (radical form) value of cos (105 degrees)

2 answers

cos 105°
= cos(60+45)
= cos60cos45 - sin60sin45
= (1/2)(√2/2) - (√3/2)(√2/2)
= (√2 - √6)/4

cos195

Ask a New Question or answer this question.

Similar Questions

How do you express sin4x as a trigonometric funcition of x using the identities? I think that you are supposed to start with the
1. 1 answer
Explain why some trigonometric identities have restrictions or non-permissiblevalues. What are the restrictions for each of the
1. 2 answers
If θ is an angle in standard position and its terminal side passes through the point (-1,3), find the exact value of
1. 3 answers
If θ is an angle in standard position and its terminal side passes through the point (-20,21), find the exact value of
1. 2 answers

more similar questions