Wednesday

April 16, 2014

April 16, 2014

Posted by **wade** on Saturday, February 27, 2010 at 10:20pm.

sin2ϴ+cos3ϴ

- math help -
**Reiny**, Saturday, February 27, 2010 at 10:46pmfirst of all you should by now have proven that

sin 2x = 2sinxcosx

by writing cos 3x as cos(2x + x), expanding that and then changing the cos 2x and sin 2x factors you can show that

cos 3x = cos^ 3x - 3 sin^2 x cos x

**Related Questions**

Math - 5. Suppose that the volumes of four stars in the Milky Way are 2.7 × 1018...

math 1012 - what is the sum of the lengths 39cm and 2m

Math - Hexadecimals, binary numbers. It's not regular addition and ...

Math for liberal arts - I have tried to get the answers, but I cannot. G. 11112...

science - Which shows the expression below simplified? (3.6 × 1015) + (1.8 × ...

cHEM II - Consider a titration of 50.00 mL of 0.1005 M HCl with 0.1012 M NaOH.

Chem II (urgent plz) - Consider a titration of 50.00 mL of 0.1005 M HCl with 0....

math - Please help me. I can't seem to get the answer of 165 degrees. Find the ...

Math for liberal arts - This question is dealing with hex, binary numbers. 1. ...

physics - To the nearest order of magnitude, how many times greater than the ...