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prove the identities sin(90- theta)= cos theta cos(90-theta)= -sin theta sin(180-theta0=sin theta cos(180-theta)= -cos theta

prove the identities
sin(90- theta)= cos theta    
cos(90-theta)= -sin theta
sin(180-theta0=sin theta
cos(180-theta)= -cos theta
                                      
 

Grade:10

1 Answers

Shubham Singh
199 Points
8 years ago
cos(90 – theta) = sin theta
use sin(A-B) and cos(A-B)

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