Whether cos²45 + cos²45= cos²90.
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yes.
cos²45+cos²45=cos²90
sin²(90-45)+cos²45=cos²90
sin²45+cos²45=cos²90
1=1. (sin²q+cos²q=1)
cos²45+cos²45=cos²90
sin²(90-45)+cos²45=cos²90
sin²45+cos²45=cos²90
1=1. (sin²q+cos²q=1)
Anonymous:
How sin²45+cos²45=cos²90,
bcoz sin(90-q)=cosq.
so...here q is 45.so when we subtract q=45 from 90.we get sin 45.
cos²90=0, which contradict the LHS (1)
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