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

4. Asked to simplify the expression sin(180−è), Rory volunteered the following solution:

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).

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