evalute:cos3A -cos4A/sin 3A+sin 4A,when A=15degree
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Cos45° = 1/√2 = Sin45°
Cos45° = 1/√2 = Sin45° Cos60° = 1/2
Cos45° = 1/√2 = Sin45° Cos60° = 1/2 Sin60° = √3/2
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