# write the expression as the sine, cosine , or tangent of an angle

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• February 4th 2010, 10:16 PM
alessandromangione
write the expression as the sine, cosine , or tangent of an angle
2 sin100 cos 100
any suggestion? thanks in advance
• February 4th 2010, 11:07 PM
Sudharaka
Quote:

Originally Posted by alessandromangione
2 sin100 cos 100
any suggestion? thanks in advance

Dear alessandromangione,

$2sin\theta\cos\theta=sin2\theta$

Therefore,
$2sin100^{o}cos100^{o}=sin(2\times100^{o})=sin200\a pprox-0.3420$

Hope this will help you.

By the way what a big name you have! Can you tell us the meaning of it??