Monday

December 22, 2014

December 22, 2014

Posted by **paula** on Saturday, January 23, 2010 at 8:51pm.

- trig -
**drwls**, Saturday, January 23, 2010 at 8:55pmIs that supposed to be cos^2(120) of cos(2*120) ?

The cosine of 120 is -cos 60 = -1/2.

That may help.

**Answer this Question**

**Related Questions**

Trig 3 - Why does 1 - COS2(Squared) _________________ COS2 = tan2

trig - solve for x if x is in radians. cos2(x) + 4cos(x) = -3

trig - solve for exact value for x between 0 and 2 pie 3sin2(x)-cos2=2?

Maths - if in a triangle ABC m angle A=π/2, then value of cos2 A + cos2 B...

maths - If S=1/2^2cos1 + 1/cos1¤cos2+1/2^3 cos1 ¤cos2¤cos2^2 + .......... upto ...

Math/Trig - Solve: 2 cos2 x - 3 cos x + 1 = 0 for 0 is less than or equal to x ...

Trig - Find the exact value of each of the following using reference angles. a)...

Math/Trig - Solve: sin2 x = cos2 x for 0 degrees is less than or equal to x is ...

trig - Rewrite 8 cos2 x as an equivalent expression that does not contain powers...

trig - verify the identity. cos2 x - sin2 x = 1 - 2sin2 x the 2's next to the ...