Saturday

April 19, 2014

April 19, 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 -

**Related Questions**

Precalculus - Use one of the identities cos(t + 2πk) = cos t or sin(t + 2&#...

Pre-Calc : Find the Exact Value of the Expression - Find the exact value of the ...

Trig Help! - Question: Trying to find cos π/12, if cos π/6 = square ...

Math, please help - Which of the following are trigonometric identities? (Can be...

Math integrals - What is the indefinite integral of ∫ [sin (π/x)]/ x^...

Trig - find all solutions to the equation √3 csc(2theta)=-2 Would the ...

Math 2nd question - Express as a single sine or cosine function (note: this is ...

MATH - Find the exact values. (a) tan(π/3) = ? (b) sin(7π/6) = ? (c) ...

Math - Use an addition or subtraction formula to write the expression as a ...

Calculus - How do I find the critical values? y= 4/x + tan(πx/8) What I ...