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- Thread starter puremath
- Start date

After completing the previous problem, I would then use the following identities:

[MATH]\sin(-x)=-\sin(x)[/MATH]

[MATH]\cos(-x)=\cos(x)[/MATH]

These come directly from the odd symmetry of the sine function, and the even symmetry of the cosine function.

1. Cohen did not enclose the arguments in parentheses.

2. There is a picture to be used with this question(s).

3. In terms of radians or degrees, I have to check the textbook again.

Ugh...

This was a copy/paste error.