Question

PLEASE HELP!! If the sin 75° is 0.966, then the cos ____° is 0.966.

Answer 1

Try this option (this is only one way):
1. rule:

`sin \alpha =cos( ( \pi )/(2) - \alpha)`
2. according to the rule

`sin75=0.966=cos( ( \pi)/(2) -75)=cos15`

answer: cos15°.