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September 17, 2014

September 17, 2014

Posted by **sarah** on Sunday, June 12, 2011 at 10:34pm.

- trigonometry -
**Reiny**, Sunday, June 12, 2011 at 10:49pmmake a diagram and use Pythagoras to find the third side x

x^2 + 1^2 = 5^2

x = sqrt(24)

so cos(theta)= sqrt(24)/5

sin(2theta) = 2sin(theta)cos(theta)

= 2(1/5)(sqrt(24)/5)

= 2sqrt(24)/25

or

= 4sqrt(6)/25

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