微積分基本公式
... ( A + B) = sin A ⋅ cos B + cos A ⋅ sin B sin( A − B) = sin A ⋅ cos B − cos A ⋅ sin B cos( A + B ) = cos A ⋅ cos B − sin A ⋅ sin B cos( A − B ) = cos A ⋅ cos B + sin A ⋅ sin B 1 sin A ⋅ cos B = sin( A + B ) + sin( A − B) 2 1 cos A ⋅ sin B = sin( A + B ...