诱导公式及两角和与差的三角函数练习题若sin(180°+α)+cos(90°+α)= -α,则cos(270°-α)+2sin(360°-α)的值为()(A)(-2/3)α (B)(-3/2)α (C)(2/3)α (D)(3/2)α请写出具体过程.

问题描述:

诱导公式及两角和与差的三角函数练习题
若sin(180°+α)+cos(90°+α)= -α,则cos(270°-α)+2sin(360°-α)的值为()
(A)(-2/3)α (B)(-3/2)α (C)(2/3)α (D)(3/2)α
请写出具体过程.