Question

Can someone please help me solve this one problem. I have a quiz tomorrow, and problems like these are the ones that are still confusing me:
-Verify the following identities:

cos(-theta)/ 1+sin(-theta) = sec(theta) + tan (theta)

Answer 1

Also, if you know any pointers in tackling these problems, that will be greatly appreciated. :)

Answer 2

it helps to define all the terms in sin cos functions

Answer 3

cos/( 1+sin) = 1/cos + sin\cos
cos/(1+sin) = (1+sin)/cos

i dont think that is an identity. Identities are always equal.

Answer 4

cos^2 = (1+sin)^2

cos^2 = 1+sin^2+2sin

cos^2 - sin^2 = 1 + 2sin

1 - sin^2 - sin^2 = 1 + 2sin

1 -2sin^2 = 1 + 2sin

-sin^2 = sin is not always true

Answer 5

of course, i did not read the negative parts of the theta :/ oh well