Positive: 23 %
Positive: 20 %

### More resources

Please help me figure out how ... (2x) + 1 & = 0 && \text{using the identity $\sin(2x) = 2\sin x\cos x$} ... You can verify that these solutions are ...
Positive: 23 %
... but does $\sin(5x)=5\sin(x)$? Can you say this for any ... then please tell me what the ... You can draw some such right triangles to verify the ...
Positive: 18 %
... sin x + cos x = 1. Email ... Help Wolfram|Alpha grow! ... Please do not include anything you consider confidential or proprietary.