If sin*sin + cos *cos =1,so by root on both sides why not sin +cos =1

1.	If sinsin + cos cos =1,so by root on both sides why not sin +cos =1 happens?
Answer» (sin^2+cos^2)=(sin+cos)^2-2sin.cos not =1. Ok sin²+cos ² ka root over 1 nhi hota

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