cos 3A-2cos 4A
sin3A+2sin4A, when A=15 degree
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Answer:
cos45°-2cos60°+sin45°+2sin60°
1✓2-2*1/2+1/✓2+2✓3/2
1/✓2-1+1✓2+✓3
✓3+✓2-1
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