cos^2C-sin^2C/cosC - sinC
C is an angle
thanks so much
I'm canceling the particular numerator with the denominator.
I'll give u a similar example,
$\displaystyle \frac{x^2 -9}{x-3} = \frac{(x-3)(x+3)}{(x-3)} = (x+3)$ lets say $\displaystyle x = 4$ and substitute it in the original equation to check, $\displaystyle \frac{((4)^2-9)}{((4)-3)} = 7$ and now sub it into $\displaystyle (x+3) = 7$
let me know if u need more help...