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Trigonometric functions of an acute angle

Trigonometric functions are commonly defined as ratios of two sides of a right triangle containing the angle. There are six basic trigonometric functions, which are tabulated here along with equations relating them to one another

Sine: The sine of an angle in a right triangle equals the opposite side divided by the hypotenuse.
Cosine: The cosine of an angle in a right triangle equals the adjacent side divided by the hypotenuse.
Tangent: The tangent is the opposite side divided by the adjacent side.
Cosecant (csc): is the reciprocal of sine, i.e. the ratio of the length of the hypotenuse to the length of the opposite side.
Secant (sec): is the reciprocal of cosine, i.e. the ratio of the length of the hypotenuse to the length of the adjacent side.
Cotangent (cot): is the reciprocal of tan, i.e. the ratio of the length of the adjacent side to the length of the opposite side.

 sin A = opposite   hypotenuse = a c csc A = hypotenuse   opposite = c a cos A = adjacent   hypotenus = b  c sec A = hypotenuse   adjacent = c a tan A = opposite  adjacent = a b cot A = adjacent opposite = b a

Look at the following right triangle, where:
a = 3
b = 9
Find the tangent of angle A

The tangent of angle A es =
(round the solution to hundredths)