If sinA+cosA=p and mcosA-nsinA=q then prove m2+n2=p2+q2
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https://www.meritnation.com/ask-answer/question/if-m-sin-0-n-cos-0-p-and-m-cos-0-n-sin-0-qthen-wha/introduction-to-trigonometry/1217616
Refer the following similar link :
https://www.meritnation.com/ask-answer/question/if-m-sin-0-n-cos-0-p-and-m-cos-0-n-sin-0-qthen-wha/introduction-to-trigonometry/1217616