Finf the exact value of sin A and cos A where a = 9 and b = 10 and

To solve for the longest side, the hypotenuse, you have to use the pythagorean theorem. It will be 10^2 + 9^2 = c^2. 100 + 81 = c^2.

c^2 = 181 so c = sqrt (181).

to find sin of A do opposite/hypotenuse which gives you 9/sqrt (181)

to find cos of A do adjacent/hypotenuse which gives you 10/sqrt (181)