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November 25, 2014

November 25, 2014

Posted by **Hayli** on Thursday, November 4, 2010 at 11:15pm.

2-cos^2x=4sin^2(1/2x)

- PRE CALC PLEASE HELP!!!!!!!! -
**Reiny**, Friday, November 5, 2010 at 8:40am2 - (1 - 2sin^2 (x/2) = 4sin^2 (x/2)

1 = 2 sin^2 (x/2)

sin^2 (x/2) = 1/2

sin (x/2) = 1/√2

x/2 = π/4 or x/2 = 3π/4

then x = π/2 or x = 3π/2

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