Common formulas:

  • \(\sin 2x = 2\sin x\cos x\)
  • \(\cos 2x = \cos^2 x - \sin^2 x\)
  • \(\sin \frac{x}{2} = \pm \sqrt{\frac{1 - \cos x}{2}}\)
  • \(\cos \frac{x}{2} = \pm \sqrt{\frac{1 + \cos x}{2}}\)
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Relations and Functions ( Maths class - 11 )

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