who will answer I will mark as brainlist
how do we get this
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Step-by-step explanation:
sin theta = opposite/ hypotenuse= pr/1= pr
cos theta = adjacent/ hypotenuse= qr/1 = qr
Consider a triangle pqr, where pq =1( hypotenuse).
qr^2 +pr^2=pq^2(by Pythagoras theorem)
which proves that cos^2 theta + sin^2 theta = 1
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