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October 21, 2014

October 21, 2014

Posted by **sally** on Saturday, April 17, 2010 at 5:57pm.

sin(180−è) = sin 180−sin è, and, because sin 180 is zero, it follows that sin(180−è) is the same as −sin è. Is this answer correct? If not, what is a correct way to express sin(180−è)

in simpler form? Answer the same question for cos(180 − è).

- Trig -
**bobpursley**, Saturday, April 17, 2010 at 6:01pmIsn't

Sin(A+B)=SinA Cos B + CosA sinB

sin(180-e)= Sin180 Cos -e + Cos180 sin -e

= 0 -sin -e=sine

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