PLS ANSWER THIS QUESTION.....
____________ ___________ _________ ___________
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Answer:
cos(theta) can be written as c sin(90-theta)
similarly,cos(81+theta)=sin(9o-(81+theta)
=cos(81+theta)=sin(90-81-theta)
=cos(81+theta)=sin(9-theta)
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it is your answer...........
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