SIMPLIFY SIN RAISE TO POWER 4 MINUS COS RAISE TO POWER4 DIVIDED BY 1 MINUS 2SIN RAISE TO POWER 2

1 answer

ever heard of math notation?

(sin^4x-cos^4x)/(1-sin^2x)
= (sin^2x+cos^2x)(sin^2x-cos^2x)/cos^2x
= tan^2x-1