Question

Simplify sin θ sec θ.

Answer 1

sec θ = 1/cos θ

so sin θ *sec θ = sin θ/ cos θ

sin θ / cos θ = tan θ

tan θ

Answer 2

Here is a reference sheet for all trig identities http://www.sosmath.com/trig/Trig5/trig5/trig5.html

Answer 3

I mean not all* but some useful ones*