Find the exact value of the sine cosine and tangent of the f

Find the exact value of the sine, cosine, and tangent of the following angles without using a calculator.

sin90°
sin = y/r
90° angle is a right angle y = 1 r= 1 x = 1

sin 90° = y/r = 1/1 = 1

or look at the curve at 90°.

Sin (pi/2) = 1

Cos (90°) = x/r

Cos (pi/2) = 0

Tan (90°) = x/y

Tan (pi/2) = infinity

Sin (90°) = 1

Cos (90°) = 0

Tan (90°) = infinity.