Thursday

September 18, 2014

September 18, 2014

Posted by **robert** on Monday, August 3, 2009 at 9:22pm.

- math -
**bobpursley**, Monday, August 3, 2009 at 9:28pmYou have a formula for

Sin(A-B)

Use that on the first one.

Now on the second, recall that

5PI/12= 3PI/12 + 2PI/12=PI/4 +PI/6

You now can use the tan (A+B) formula, as you know the tan(PI/4) and tan(PI/6)

**Answer this Question**

**Related Questions**

Math(Please help) - 1)tan Q = -3/4 Find cosQ -3^2 + 4^2 = x^2 9+16 = sqrt 25 = 5...

Math(Please help) - 2) Use the sum and difference identites sin[x + pi/4] + sin[...

PreCalculus - Hi I need some assistance on this problem find the exact value do ...

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

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

math - Prove these identites I really need help with these I dont understand ...

math - Prove these identites I really need help with these I dont understand how...

Math - Prove these identites I really need help with these I dont understand ...

PreCal - Simplify using identites tan(-x)cosx

math - use exact values of the sin,cos and tan of (pi/3) and (pi/6)(which I have...