मराठी

Conversion Formulae in Trigonometry

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Estimated time: 4 minutes
Maharashtra State Board: Class 12

Formula: Conversion of Sum or Difference into Product

Sr. No. Expression Formula
i. sin C + sin D \[2\sin\frac{\mathrm{C}+\mathrm{D}}{2}\cos\frac{\mathrm{C}-\mathrm{D}}{2}\]
ii. sin C − sin D \[2\cos\frac{C+D}{2}\sin\frac{C-D}{2}\]
iii. cos C + cos D \[2\cos\frac{C+D}{2}\cos\frac{C-D}{2}\]
iv. cos C − cos D

\[=2\sin\frac{C+D}{2}\sin\frac{D-C}{2}\]

\[=-2\sin\frac{C+D}{2}\sin\frac{C-D}{2}\]

Maharashtra State Board: Class 12

Formula: Conversion of Product into Sum or Difference

Sr. No. Expression Formula
i. 2 sin A cos B sin(A + B) + sin(A − B)
ii. 2 cos A sin B sin(A + B) − sin(A − B)
iii. 2 cos A cos B cos(A + B) + cos(A − B)
iv. 2 sin A sin B cos(A − B) − cos(A + B)
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