sin^2 (A)+sin^2(B)-sin^2(A)sin^2(B)+cos^2(A)cos^2(B)
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sin^2(A)+sin^2(B)-sin^2(A)sin^2(B)+cos^2(A)cos^2(B)sin^2(A)+sin^2(B)-sin^2(A)sin^2(B)+cos^2(A)cos^2(
sin^2 (A)+sin^2(B)-sin^2(A)sin^2(B)+cos^2(A)cos^2(B)
sin^2 (A)+sin^2(B)-sin^2(A)sin^2(B)+cos^2(A)cos^2(B)
sin^2 (A)+sin^2(B)-sin^2(A)sin^2(B)+cos^2(A)cos^2(B)
最后=1 具体过程我打给你了 这里打不下
【证明】Sin A+sin B=2Sin 22
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sin^2 (A)+sin^2(B)-sin^2(A)sin^2(B)+cos^2(A)cos^2(B)
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