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2015-02-20T13:25:05+08:00
Cos tan=sin tan=sin/cos therefore: cos sin/cos=sin then cancel the cos so that sin=sin
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2015-02-20T17:32:49+08:00

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Cos=cos
sin=sin
tan=\frac{sin}{cos}

The equation is:
cos tan=sin
Since there are no operations in the middle, we can classify it as multiplication. Now, tan is sin over cos, so substitute:

cos(\frac{sin}{cos})=sin

Since you will multiply the cos to tan, the cos will be canceled.
sin=sin

Hope this helps =)
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