Question

11) If cot 0 + cos 0 = m and cot 0 - cos 0 = n, then prove that (m2 - n2)2 = 16 mn.
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Answer 1

Answer:

If sinθ−cosθ=0, then the value of (sinθ+cosθ) is. A ... Prove that: cosAsin 3A+ sinAcos3A=2cot2A