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Verify that the equation given below is an identity. (Hint: cos2x = cos(x + x).) cos2x = cotx-1 cotx + 1
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Answer Cos 20c = cotx-1 . Cot²xth RoHS = cotx-1 CO2+1 sin²x Costa sin2x Costa- sinta sinta Cos²x+ sin²x cos2x-sinza Chx + Ях

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