Math Is Fun Forum

I want to submit a trignometry formula requiring a proof but this space would not allow me to either write the formula in the proper way or to copy and paste it from somewhere else. How do I go about doing this.

The trig formual I want proof of is as follows:

cos2x/(1+3sinx-4sin2x)=(1+sinx)/(1+4sinx)

Note that the cos2x in the numerator on the LHS should be cos squared x and 4sin2x in the denominator should be 4sin squared x. Unfortunately I can't express them as such here.