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Trigonometry> prove the identities sin(90- theta)= cos ...

question mark

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

Archith Sudheendra , 9 Years ago

Grade 10

1 Answers

Shubham Singh

Last Activity: 9 Years ago

cos(90 – theta) = sin theta

use sin(A-B) and cos(A-B)

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