Question
Tue March 05, 2013 By:
 

If tan θ + sec θ = exp(x)(ie, e^x) , Find cos θ.

Expert Reply
Wed March 06, 2013
tanΦ+secΦ=e^x
secΦ-tanΦ=e^-x
so 2secΦ=e^x-e^-x
cosΦ=2/(e^x-e^-x)
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