# Question #19c60

##### 1 Answer

Nov 8, 2014

by subtracting

since sine is an odd function, and cosine is an even function,

by using special triangles,

I hope that this was helpful.

Nov 8, 2014

by subtracting

since sine is an odd function, and cosine is an even function,

by using special triangles,

I hope that this was helpful.

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