17.4 Solving expressions using 454590 special right triangles
Solving expressions using 454590 special right triangles
Lessons
Notes:
$\sin 45^\circ = {1 \over \sqrt 2}$$\cos 45^\circ =
{1 \over \sqrt 2}$$\tan 45^\circ = {1 \over 1} = 1$

2.
If $\theta = 45^\circ$, find the exact value of following expressions.