हिंदी

Trigonometric Functions of Sub-Multiple Angles

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Formula: Trigonometric Functions of Sub-Multiple Angles

Function Formula
sin θ  =\[2\sin\left(\frac{\theta}{2}\right)\cos\left(\frac{\theta}{2}\right)\]
=\[\frac{2\tan\left(\frac{\theta}{2}\right)}{1+\tan^2\left(\frac{\theta}{2}\right)}\]
cos θ  = \[\cos^{2}\left(\frac{\theta}{2}\right)-\sin^{2}\left(\frac{\theta}{2}\right)\]
\[=1-2\sin^2\left(\frac{\theta}{2}\right)\]
\[=2\cos^2\left(\frac{\theta}{2}\right)-1\]
\[=\frac{1-\tan^2\left(\frac{\theta}{2}\right)}{1+\tan^2\left(\frac{\theta}{2}\right)}\]
tan θ  \[=\frac{2\tan\left(\frac{\theta}{2}\right)}{1-\tan^{2}\left(\frac{\theta}{2}\right)}\]
cot θ  \[=\frac{\cot^2\frac{θ}{2}-1}{2\cot\frac{θ}{2}}\]
sin θ  \[=3\sin\left(\frac{ θ }{3}\right)-4\sin^3\left(\frac{ θ }{3}\right)\]
cos θ  \[4\cos^3\left(\frac{θ}{3}\right)-3\cos\left(\frac{θ}{3}\right)\]
tan θ  \[=\frac{3\tan\left(\frac{θ}{3}\right)-\tan^{3}\left(\frac{θ}{3}\right)}{1-3\tan^{2}\left(\frac{θ}{3}\right)}\]
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