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Consider a triangle PQR ,right at R ,in ...

Consider a triangle PQR ,right at R ,in which PQ = 29 units ,QR =21 units and ` angle PQR =theta ,`then find the values of
(i) ` cos ^(2) theta + sin ^(2) theta and (ii) cos ^(2) theta -sin ^(2) theta `

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The correct Answer is:
` ( -41)/( 841) `
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