Hi all,
I'm stuck with just one step now of a long problem.
Basically, how do I get from
to
I've been told I need to use just one trigonometric identity, but I honestly can't think of any that will do it?
Many thanks.
Hi all,
I'm stuck with just one step now of a long problem.
Basically, how do I get from
to
I've been told I need to use just one trigonometric identity, but I honestly can't think of any that will do it?
Many thanks.