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 Oct 30 comment Is this conjecture about integration of sinusoids on a specific interval correct? I'm not sure why the integral of $sin(k(x+j))$ is $\frac{-1}{k}cos(k(x+j))$. Where is the 1/k coming from? Oct 30 accepted Is this conjecture about integration of sinusoids on a specific interval correct? Oct 30 revised Is this conjecture about integration of sinusoids on a specific interval correct? removed redundancy Oct 29 comment Is this conjecture about integration of sinusoids on a specific interval correct? Why isn't the j relevant? If it was shifted left or right, wouldn't that change where the halves line up? Oct 29 asked Is this conjecture about integration of sinusoids on a specific interval correct? Oct 7 awarded Scholar Oct 7 awarded Supporter Oct 7 comment Homework Help: revolutions and trigonometry +1 for an great diagram and clarity in answer Oct 7 accepted Homework Help: revolutions and trigonometry Oct 7 awarded Student Oct 6 comment Homework Help: revolutions and trigonometry Well, I tried a couple things with the assumption the distance around the circle I was looking for was 45 ft, but that's obviously wrong. I tried (sorry for no LaTeX): 50pi ft/40 sec = (45/50pi ft)/x sec and other ratio things. I tried a number of sin-inverses: 45/50pi, 20/50pi (because r=25, 45-25=20) Oct 6 asked Homework Help: revolutions and trigonometry Sep 9 answered Work and Time calculation Jun 21 awarded Editor Jun 21 revised What is the usefulness of matrices? I never added a note on matrix use in calculators Jun 19 awarded Teacher Jun 19 answered What is the usefulness of matrices?