Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesMaximum and minimum values of trigonometrical functions, Conditional trigonometrical identities
EasyIf $A + B = \frac{\pi}{2}$,what is the maximum value of $\cos A \cos B$?
- A$\frac{1}{2}$
- B$\frac{3}{4}$
- C$1$
- D$\frac{4}{3}$
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View SolutionIf $\sin \theta = \frac{1}{2} \left( \sqrt{\frac{x}{y}} + \sqrt{\frac{y}{x}} \right)$,where $x, y \in \mathbb{R} - \{0\}$. Then:
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