Question

In triangle ABC, right-angled at B. if tan A=1/root3
find the value of=
cos A cos C -sin A sin C
​

Answer 1

cosA.cosC-sinA.sinC

=√3/2×1/2-1/2×√3/2

=√3/4-√3/4

=0

Answer 2

Answer:

The highest value of cosine of any angle is 1.

Step-by-step explanation:

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. Closer the approach, higher is the value.