根号2/4sin(45°-x)+根号6/4cos(45°-x)
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根号2/4sin(45°-x)+根号6/4cos(45°-x)
利用和(差)角公式化简 只化简,
利用和(差)角公式化简 只化简,
![根号2/4sin(45°-x)+根号6/4cos(45°-x)](/uploads/image/z/19688136-24-6.jpg?t=%E6%A0%B9%E5%8F%B72%2F4sin%2845%C2%B0-x%EF%BC%89%2B%E6%A0%B9%E5%8F%B76%2F4cos%2845%C2%B0-x%29)
根号2/4 sin(45°-x)+根号6/4 cos(45°-x)
=根号2/2[1/2 cos(45°-x)+(根号3)/2 sin(45°-x)]/2sin(90°-2x)
=根号2/2[sin30°cos(45°-x)+cos30°sin(45°-x)]
=根号2/2sin(75°-x)
=根号2/2[1/2 cos(45°-x)+(根号3)/2 sin(45°-x)]/2sin(90°-2x)
=根号2/2[sin30°cos(45°-x)+cos30°sin(45°-x)]
=根号2/2sin(75°-x)
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