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April 19, 2015

April 19, 2015

Posted by **jaden** on Sunday, May 19, 2013 at 4:22am.

1. Sin 237

2. cos 33

3. cos 3

4. cos 66

- trigonometry -
**Steve**, Sunday, May 19, 2013 at 5:48amsin 237 = sin(180+57) = -sin 57 = -m

cos 33 = cos(90-57) = sin 57 = m

cos 3 = cos(60-57) = cos60cos57+sin60sin57 = m/2 + m√3/2 = m/2(1+√3)

cos 66 = cos(60+6)

= cos60cos6 - sin60sin6

Use your double angle formulas to get sin(6) and cos(6) from cos(3) and sin(3)

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