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July 23, 2014

July 23, 2014

Posted by **Ram** on Friday, October 21, 2011 at 2:29pm.

- trig -
**Steve**, Friday, October 21, 2011 at 3:36pmIf you mean tan(75/2), then

sin^{2}15 = (1+cos30)/2 = (2-√3)/4

cos^{2}15 = (1-cos30)/2 = (2+√3)/4

sin75 = cos15

cos75 = sin15

tan 75/2 = (1-cos75)/sin75

= (1 - √(2-√3)/4)/√((2+√3)/4)

= (2 - √(2 - √3))/√(2 + √3)

= 0.7673

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