Answers

2014-01-13T00:57:01+08:00
Note that i made it (+) sinx/cosx because otherwise, it won't be equal. Double check if your plus/minus signs are correct :)

 \frac{sinx}{sinx} + \frac{cosx}{sinx} - \frac{cosx}{cosx} + \frac{sinx}{cosx} = secxcscx
1+ \frac{cosx}{sinx} - 1 + \frac{sinx}{cosx} = \frac{1}{cosx}}\frac{1}{sinx}
 \frac{cos^2x + sin^2 x}{cosxsinx} = \frac{1}{cosxsinx}
\frac{1}{cosxsinx} = \frac{1}{cosxsinx}
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