03-08-2016
Mathematics

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(sin3t+cos3t)/(cos3t-sin3t)=? Please help

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03-08-2016

Hello,

Let's assume 3t=a.

[tex] \dfrac{sin(a)+cos(a)}{cos(a)-sin(a)} = \dfrac{(cos(a)+sin(a))^2}{cos^2(a)-sin^2(a)}\\\\ = \dfrac{1+2sin(a)cos(a)}{cos(2a)}= \dfrac{1+sin(2a)}{cos(2a)} with\ a=3t[/tex]

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