Cos3a-2cos4a÷sin3a+2sin4a when a=15
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Cos45 - 2 cos 60 ÷ sin45 + 2 sin 60
Cos45 - 1 ÷ 1/√2 + 2 sin 60
1/√2 - √2 + √3
1- 2 + √6 ÷ √2
√12 - √2 ÷ 2
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