JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

1 Easy

1 of 1

Application +4 | -1

In a

\Delta \;ABC

, if

2s = a + b + c

, then the value of the

\frac{{s\left( {s - a} \right)}}{{bc}} - \frac{{\left( {s - b} \right)\left( {s - c} \right)}}{{bc}}

is equal to

View answer and explanation

Correct option: B

\cos A

Option B (cos A) is correct because the given expression simplifies to cos²(A/2) - sin²(A/2), which is equal to cos A using trigonometric identities.

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