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September 20, 2014

September 20, 2014

Posted by **Leslie** on Thursday, March 1, 2012 at 4:49pm.

1. ((x/4)-(1/x)) / ((1/2x)+(1/4))

VERIFY

1. secXsin2X = (2-2cos^2X)/sinX

- Math -
**Steve**, Thursday, March 1, 2012 at 5:15pm((x/4)-(1/x)) / ((1/2x)+(1/4))

((x^2-4)/4x) / ((2+x)/4x)

(x^2-4) / (x+2)

(x+2)(x-2)/(x+2)

x-2

secX*2sinXcosX = 2(1-cos^2X)/sinX

2sinX = 2sin^2X/sinX

2sinX = 2sinX

- Math -
**Leslie**, Thursday, March 1, 2012 at 5:20pmOMG thank you so much!

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