Question

Use basic trigonometric identities to simplify the expression: tan3 (x) + tan (x) = ?

sin2 (x) − 1
cos2 (x) − 1
tan (x) sec2 (x)
tan (x) sec (x)

Answer 1

sin2(X)-1= -cos2(X)

cos2(X)-1= -sin2(X)

sin(X) *. 1

-----------. ------------. = sin(X)/cos3(X)

cos(X). cos2(X)

tan(X)*sec(X)= sin(X)

-----------

cos2(X)