Question

verify: tan^2 θ+1 / 1-sin^2 θ =sec^4θ

Answer 1

tan^2theta + 1 = sec^2theta
and 1- sin^2theta = cos^2theta

so, sec^2theta/cos^2theta = sec^4theta, as cos^2theta = 1/sec^2theta

Answer 2

proved @lajessica.

Answer 3

thank you so much !

Answer 4

:)

Answer 5

yw