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February 27, 2015

February 27, 2015

Posted by **Blake** on Wednesday, April 27, 2011 at 8:23pm.

Types of Identities:

Double Angle, Half Angle, Sum and Difference of Sine, Cosine, and Tangent, Pythagorean, Reciprocal, Quotient.

Thanks

- trig -
**Blake**, Wednesday, April 27, 2011 at 8:35pmPIa = pi*a

PI/2 = pi/2

- trig -
**Mgraph**, Wednesday, April 27, 2011 at 8:36pmE=-20cos(pi*a/4)

- trig -
**Blake**, Wednesday, April 27, 2011 at 8:39pmAny chance you could show a bit of work? Thanks.

- trig -
**Mgraph**, Wednesday, April 27, 2011 at 10:08pmsin(x-y)=sin(x)cos(y)-sin(y)cos(x)

Let y=pi/2

sin(x-pi/2)=sin(x)*0-1*cos(x)=-cos(x)

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