Demostrar identidad trigonométrica (lo subrayado es elevado )
sec4x-1=tan4x+2tan2x
sec4x-1=tan4x+2tan2x
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(sec²x -1)(sec²x +1) = tan⁴x +2tan²x por identidad trigonometrica sec²x = 1 + tan²x
(1+tan²x -1) (1 +tan²x +1) = tan⁴x +2tan²x
tan²x(2 + tan²x) = tan⁴x +2tan²x
2tan²x +tan⁴x = tan⁴x +2tan²x
tan⁴x +2tan²x = tan⁴x +2tan²x