Question

In a plane, triangle. Find the maximum value of cosa cosb cosc

Answer 1

Answer:

We know cos 0 = 1 and cos 90 = 0.

The highest value of cosine of any angle is 1.

This can happen if the value of the angle A, B or C is zero. But that can not happen because in that case the triangle will collapse to a line.

So the highest value will occur if the value of the angle approaches zero, but is not equal to zero.