Mark the Correct alternative in the following:

In a ∆ABC, if a = 2, ∠B = 60^o and ∠C = 75^o, then b =

In any ∆ABC, find the value of ∑ a (sin B – sin C)

Mark the Correct alternative in the following:

In any ∆ABC,

Mark the Correct alternative in the following:

In the sides of triangle are in the ratio then the measure of its greatest angle is

Mark the Correct alternative in the following:

In any ∆ABC, (bc cos A + ca cos B + ab cos C) =