What are the coordinates for the angle π/4 on tge unit circle

Both x and y are which is the same as

In other words, the point is on the unit circle for the angle pi/4 radians. This point is equivalent to

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Explanation:

The angle pi/4 radians is equivalent to 45 degrees. Draw out a 45-45-90 triangle with hypotenuse 1, and you'll find the congruent legs are each units long (apply the pythagorean theorem). If you apply the sine and cosine ratios, you'll get the answer shown above.

Recall that

and also

The pythagorean theorem is a^2+b^2 = c^2.

2

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify