Tuesday, June 5, 2012

Prove the identity: csc x - cot x = sinx/1+cosx

The identity csc x - cot x = sin x/(1+cos x) has to be
proved.


Start from the left hand
side


csc x - cot x


csc x = 1/
sin x and cot x = cos x/ sin x


=> 1/sin x - cos
x/sin x


=> (1 - cos x)/sin
x


=> (1 - cos x)(1 + cos x)/(sin x)*(1 + cos
)


=> (1 - (cos x)^2)/(sin x)*(1 + cos
)


=> (sin x)^2/(sin x)*(1 + cos
)


=> sin x / (1 + cos
)


which is the right  hand
side.


This proves csc x - cot x = sin
x/(1+cos x)

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