JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

1 Easy

1 of 1

Application +4 | -1

\Delta \;ABC,\left( {b + c} \right)\cos A + \left( {c + a} \right)\cos B + \left( {a + b} \right)\cos C

is equal to

View answer and explanation

Correct option: C

a + b + c

Option C

a + b + c

is correct because it is derived by expanding the expression and using the projection formula.

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