Question

The value of sinA and CosA is always less than 1. Why?

Answer 1

Since the hypotenuse (denominator) is always greater than the opposite or adjacent side (numerator), the ratio will always be smaller than one.
hope it helps.

Answer 2

In general, the value of sinA as well as CosA is always less than 1 because it goes back to the definition (one of many) that for a right triangle, the sine is the opposite side divided by the hypotenuse.  

Due to this, side is always ≤ the hypotenuse, the ratio has to be ≤ 1.