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October 20, 2014

October 20, 2014

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

*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)

- Math -
**bobpursley**, Sunday, November 25, 2007 at 2:46pm11 is 5 + 6

-7 is -12 + 5

-5 is -2 -3

13 is 2 + 11, and 11 is above.

Watch the algebra.

- Math -
**Anonymous**, Sunday, November 25, 2007 at 4:40pm5 and 6 over what?

They have to either be over 3, 4, 6, or 2.

- Math -

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