# Identities homework problem

1. Homework Statement
I'm on the last section of identities entitled half angle identities. This one seems to give me some trouble because I have never encountered one with a horizontal shift in it. Tips?

tan 1/2( ß + π/2 ) = ( 1 + sin ß ) / cos ß

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Tom Mattson
Staff Emeritus
$$\tan(\theta)=\frac{\sin(\theta)}{\cos(\theta)}$$
Now, what do the graphs of the sine and cosine functions look like when you shift them to the left by $\frac{\pi}{2}$ rad?