Need help with trigonometry please!

I have to prove:

(1-sin^2xcsc^2x +sin^2x)/cos^2x = tan^2x

Every time I solve it i get it equal to tan^2x + 1

Could someone help me, any help would be appreciated thanks!

Well the csc^2(x) can be made to be 1/sin^2(x), so then you will have sin^2(x)[1/(sin^2(x))] and those cancel out to give you 1.

So now you have 1-1+sin^2(x)/[cos^2(x)]. The ones cancel each other out.

And then sin^2(x)/cos^2(x)= tan^2(x)

working from the left hand side

(1-sin^2x*csc^2x+sin^2x)/cos^2x =
(1-1+sin^2x)/cos^2x =
sin^2x/cos^2x = tan^2x

the key here is that csc^2x = 1/sin^2x, so sin^2x * csc^2x = 1