Sin, cosine, and tangent are considered the three main of trigonometry, commonly written as sin, cos, and tan.
sin(θ) = O/H
cos(θ) = A/H
tan(θ) = O/A
Where O is opposite
Where H is Hypotenuse
Where A is Adjacent
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The cosine is ±1/sqrt(5) = ±0.4472 (approx).
Because it tends to infinity. Additionally, tangent can be expressed as sin theta divided by cos theta. The sine of 90 is 1. The cosine of 90 is 0. That would be 1 divided by 0, or division by zero; which is undefined.
You can use your trigonometric functions (sine, cosine, and tangent).
They are used to find the angle or side measurement of a right triangle. For example, if 2 sides of a right triangle have known values and an angle has a known measurement, you can find the third side by using sine, cosine or tangent.
45 degree