任意角的三角函数.(1)msin(7pai/2)+ntan(-4pai)+pcos(5pai/2); (2)(a^2)s
3个回答
(1)原式=msin(pai/2)+ntan0+pcos(pai/2)=m
(2)原式=(a^2)+(b^2)+ [(a^2)-(b^2)] - 2ab=2(a^2)-2ab=2a(a-b)
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