What is sin 45 expressed as a square root?

√2 / 2

Step-by-step explanation:

If you draw a right triangle with sides = 1, then by Pythagoras the diagonal is sqrt(2). The angles are 45, 45, and 90. Sine = Opposite / Hypotenuse So sin 45 = 1 / sqrt(2). To eliminate the square root in the denominator, multiply numerator and denominator by sqrt(2).

This leaves it unchanged since sqrt(2) / sqrt(2) = 1. So sin 45 = sqrt(2)/2.

x is greater than 5

step-by-step explanation:

2x+7 is greater than 17

    -7                           -7

2x is greater than 10

divide by 2 each side

x is greater than 5