Question

Simplify cos 0 + cos0tan^20

Answer 1

sec theta

Explanation:

we have this as follows;

cos theta +cos theta tan^2 theta

= cos theta (1 + tan^2 theta)

Recall;

1 + tan^2 theta = sec^2 theta

= sec^2 theta * cos theta

Recall;

sec theta = 1/ cos theta

= 1/cos theta * cos theta * 1/cos theta

= 1/cos theta = sec theta