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Given Tana = - 3 / 4, find the square of 2 + sinacosa cosa The detailed process is needed. According to the square of sina + the square of cosa = 1, the detailed process solution is obtained, and the detailed and fast additional fraction is obtained
sina/cosa=tana=-3/4
sina=-4/3*cosa
square
sin²a=16/9*cos²a
sin²a+cos²a=1
So cos & # 178; a = 9 / 25
So sinacosa
=(-4/3*cosa)cosa
=-4/3*cos²a
=-12/25
So the original formula is 29 / 25
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