Sine allows us to find out what a third side or an angle is using the equation sin(x) = opposite over hypotenuse (x being the angle).
Cosine has the same function but instead uses the equation cosine(x)= opposite over adjacent
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You can use your trigonometric functions (sine, cosine, and tangent).
Sine= Opposite/ Hypotenuse Cosine= Adjacent/ Hypotenuse
√ 1/2 = sine(45)= cosine(45) -Key
The sine and cosine of acute angles are equal only for 45° sin45° = cos 45° = 1/sqrt(2) = 0.7071
at a 45 degree angle, or pi/4