petdevil2
petdevil2
17-02-2017
Mathematics
contestada
Sin2x-cos3x rewrite with only sin x and cos x.
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jdoe0001
jdoe0001
17-02-2017
well then, the cheap answer is [tex]\bf sin(2x)-cos(3x)\\\\ -----------------------------\\\\ \textit{Double Angle Identities} \\ \quad \\ \boxed{sin(2\theta)=2sin(\theta)cos(\theta)} \\ \quad \\ cos(2\theta)= \begin{cases} cos^2(\theta)-sin^2(\theta)\\ 1-2sin^2(\theta)\\ 2cos^2(\theta)-1 \end{cases} \\ \quad \\ tan(2\theta)=\cfrac{2tan(\theta)}{1-tan^2(\theta)} \\\\ and \\\\ \textit{triple angle identities} \\\\ \boxed{cos(3\theta)=4cos^3(\theta)-3cos(\theta) } [/tex]
rather obvious
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