Saturday

March 28, 2015

March 28, 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)

**Answer this Question**

**Related Questions**

tigonometry - expres the following as sums and differences of sines or cosines ...

TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...

Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...

trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...

algebra - Can someone please help me do this problem? That would be great! ...

Math - Calculus - The identity below is significant because it relates 3 ...

pre-cal - Simplify the given expression........? (2sin2x)(cos6x) sin 2x and cos ...

Trig - Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 < v < ...

calculus - Differentiate. y= (cos x)^x u= cos x du= -sin x dx ln y = ln(cos x)^x...

Calc. - Differentiate. y= (cos x)^x u= cos x du= -sin x dx ln y = ln(cos x)^x ln...