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What is (sin x + sin 3x)/(cos x + cos 3x) ? |
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Answer» Answer: =(sin7x+sinx) +SIN4X =SIN(4X+ 3x) +sin(4x-3x) +sin4x so by using: sin(A+B) + sin(A-B) =2sins. COSB 2sin4x.cos3x+sin4x |
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