Wednesday

October 1, 2014

October 1, 2014

Posted by **Lucy X** on Sunday, December 7, 2008 at 8:21pm.

Use the addition and subtraction formulas ti fubd the exact values of the trigonometric ratios:

cos(-7pi/12)

Okay, I'm just having trouble with a rather basic part of the question...

I wrote cos(pi/4 + pi/3), but now I realized that the trig ratio is negative. How do I write -7pi/12 as the sum/difference of two trig ratios?

**Answer this Question**

**Related Questions**

MATH - 1.)Find the exact solution algebriacally, if possible: (PLEASE SHOW ALL ...

Math- Trig - 1. Determine the exact value of cos^-1 (pi/2). Give number and ...

trig - given that 1/2pi<theta<pi and sin theta=1/5, use appropriate ...

Trigonometry - Checking my work - Find the sum of the three smallest positive ...

CALCULUS - If cos(t)=–7/9, find the values of the following trigonometric ...

math - Eliminate the parameter (What does that mean?) and write a rectangular ...

math - Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the ...

Trigonometry - I'm confused about how to get the answer of this question. If cos...

Trigonometry - How do you find the exact value of cos -7pi/12 without using a ...

math - Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the ...