cos²(π/4-α/2)如何变换到sin²(π/4+α/2)
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cos²(π/4-α/2)如何变换到sin²(π/4+α/2)
cos²(π/4-α/2)如何变换到sin²(π/4+α/2)
cos²(π/4-α/2)如何变换到sin²(π/4+α/2)
cos ² (π / 4 - a / 2)
= cos ²【(π / 2 - π / 4)- a / 2 】
= cos ²【π / 2 - (π / 4 + a / 2)】
= sin ² -(π / 4 + a / 2)
= sin (π / 4 + a / 2)