Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesMaximum and minimum values of trigonometrical functions, Conditional trigonometrical identities
Difficultજો $P+Q+R=\frac{\pi}{4}$,હોય તો $\cos \left(\frac{\pi}{8}-P\right)+\cos \left(\frac{\pi}{8}-Q\right)+\cos \left(\frac{\pi}{8}-R\right)=$
- A$4 \cos \frac{P}{2} \cos \frac{Q}{2} \cos \frac{R}{2}-\cos \frac{\pi}{8}$
- B$4 \cos \frac{P}{2} \cos \frac{Q}{2} \cos \frac{R}{2}+\cos \frac{\pi}{8}$
- C$4 \sin \frac{P}{2} \cos \frac{Q}{2} \cos \frac{R}{2}-\cos \frac{\pi}{8}$
- D$4 \sin \frac{P}{2} \cos \frac{Q}{2} \cos \frac{R}{2}+\cos \frac{\pi}{8}$
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