cos45°sin²30°+2分之根号2sin²60°
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![cos45°sin²30°+2分之根号2sin²60°](/uploads/image/z/8560136-56-6.jpg?t=cos45%C2%B0sin%26%23178%3B30%C2%B0%2B2%E5%88%86%E4%B9%8B%E6%A0%B9%E5%8F%B72sin%26%23178%3B60%C2%B0)
cos45°sin²30°+2分之根号2sin²60°
cos45°sin²30°+2分之根号2sin²60°
cos45°sin²30°+2分之根号2sin²60°
cos45°sin²30°+2分之根号2sin²60°
=√2/2×1/4+√2/2 ×3/4
=√2/2×(1/4+3/4)
=√2/2×1
=√2/2
原式=√2/2×1/4+√2×3/4/2
=√2/8+3√3/8
=√3/2.