Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesMaximum and minimum values of trigonometrical functions, Conditional trigonometrical identities
MediumIf $A + B = \pi / 2$,then the maximum value of $\cos A \cos B$ is:
- A$1/2$
- B$3/4$
- C$1$
- D$4/3$
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