点击看大尺稿图就行陵物孝了,是这样的蚂或:
1.tan²a-sin²a=sin²a/cos²a-sin²a=sin²a/cos²a-sin²a*cos²则没a/cos²a=sin²a/cos²a*(1-cos²a)=tan²激岁a*sin²a2.sin(-a-5π)*cos(a-π/2)-tan(a- 3π/2 )孙铅纳*tan(2π-a)=sin(a)*sin(a)-cot(a)*tan(a)=sin²a-1=-cos²a