How to solve cot x cos2x=2cot x
cotxcos2x = 2cotxcos2x = 2cotx/cotxcos2x = 2cos2x = 2cos²x - 12cos²x - 1 = 22cos²x = 2+12cos²x = 3cos²x = 3/2√cos²x = plus minus √(3/2)cosx = plus minus √(3/2)
cot(x)cos(2x) = 2cot(x) cot(x) cot(x) cos(2x) = 2It is undefined.
