Julitar70
Julitar70
15-08-2016
Mathematics
contestada
How to solve cot x cos2x=2cot x
Respuesta :
princegn
princegn
15-08-2016
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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Panoyin
Panoyin
15-08-2016
cot(x)cos(2x) = 2cot(x)
cot(x) cot(x)
cos(2x) = 2
It is undefined.
Answer Link
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