JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

1 Easy

1 of 1

Application +4 | -1

If, in a

\Delta \,ABC,\,\,\left( {a + b + c} \right)\,\,\left( {b + c - a} \right) = \lambda \;\,bc

, then

View answer and explanation

Correct option: D

0 < \lambda < 4

The correct answer is D (

0 < \lambda < 4

) because the given equation can be rewritten in terms of

\cos^2(\frac{A}{2})

, which must be between 0 and 1.

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