Posted by **Anonymous** on Sunday, November 25, 2007 at 2:25pm.

Evaluate

*Note - We have to find the exact value of these. That I know to do. For example sin5π/12 will be broken into sin (π/6) + (π/4)

So...

sin 5π/12

sin (π/6) + (π/4)

sin π/6 cos π/4 + cos π/6 sin π/4

I get all those steps. The part I am struggling with is breaking these into 2 simple ones.

a) sin 11π/12

b) cos 13π/12

c) tan (-7π/12)

d) tan (-5π/12)

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