Simplify \frac{\sin(3x) - \sin(x)}{\cos(3x) - \cos(x)} to an expression involving a single trigonometric function.
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We know that sin(3.) and sin(.) are both sine functions, so we can use the product-to-sum formula for sine: sin(3.) sin(.) = (1/2)[cos(3. - .) - cos(3. + .)] Show more…
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