How-To

Question: Please find an equation of the following sinusoid, in the form $a\sin{bx+c}$: $$2\cos{2x}-7\sin{2x}$$ Just face it, although it is certainly quite possible to find a sinusoid by pure math (shown at the bottom of this post), we all would like a shortcut to it. And here is the shortcut… This method can be used … Read more