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Mathematics
Clay Henry
12 August, 10:26
How to solve cot x cos2x=2cot x
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Karen Mitchell
12 August, 12:16
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Cotxcos2x = 2cotx
cos2x = 2cotx/cotx
cos2x = 2
cos2x = 2cos²x - 1
2cos²x - 1 = 2
2cos²x = 2+1
2cos²x = 3
cos²x = 3/2
√cos²x = plus minus √ (3/2)
cosx = plus minus √ (3/2)
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Abbie Ray
12 August, 12:34
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Cot (x) cos (2x) = 2cot (x)
cot (x) cot (x)
cos (2x) = 2
It is undefined.
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