Friday

January 30, 2015

January 30, 2015

Posted by **Phil-- HELP NEEDED ASAP** on Friday, May 10, 2013 at 9:46am.

sin(3π/4+5π/6)

I've done:

sin(9π/12 + 10π/12)

=sin(19π/12)

What do I do now? Im confused if that would just be the answer or what? Wouldnt the answer be numerical?

- Pre-Calc : Find the Exact Value of the Expression -
**Steve**, Friday, May 10, 2013 at 10:57amsin(19π/12) = sin(3π/2 + π/12) = -cos(π/12)

Now use the half-angle formula to evaluate that.

- Pre-Calc : Find the Exact Value of the Expression -
**Phil-- HELP NEEDED ASAP**, Friday, May 10, 2013 at 12:06pmThank you!

- Pre-Calc : Find the Exact Value of the Expression -
**Anonymous**, Saturday, March 22, 2014 at 5:25pmtan(-15)

**Answer this Question**

**Related Questions**

Math - Evaluate *Note - We have to find the exact value of these. That I know to...

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

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

Advanced Functions/Precalculus - 1. The expression sinπ is equal to 0, ...

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

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

Calc - If n is a positive integer, find the limit as n approaches +∞ of 1/...

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