√2/2【1/2sin(π/4-x)+√6/4cos(π/4-x)】=-√2/2sin(x-7π/12)左边是怎么变形到右边的,7π/12是怎么计算出来的!(1)你题目不对应√2/2【1/2sin(π/4-x)+√3/2cos(π/4-x)】=-√2/2sin(x-7π/12)(2)方法√2/2【1/...
三角函数辅助角公式问题!√2/2【1/2sin(π/4-x)+√6/4cos(π/4-x)】=-√2/2sin(x-7π
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