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Trigonometry
The reciprocal trigonometric ratios: secant

It is said that there are six ratios possible for the lengths of the sides of a right triangle. You have learned about the sine (sin), cosine (cos), and tangent (tan) ratios. The three other trigonometric ratios are their reciprocals.

Secant (sec): is the reciprocal of cosine, i.e. the ratio of the length of the hypotenuse to the length of the adjacent side.

 sec θ = _1_ cosθ = hyp adj

Important note: There is a big difference between sec θ and cos-1x. The first one means "1/cos θ". The second one involves finding an angle whose cosine is x. So on your calculator, don't use your cos-1 button to find sec θ.

 Find the value of secB

First find the length of the hypotenuse. Using the Pythagorean Theorem, or recognizing the Pythagorean Triple 5-12-13, the length of the hypotenuse is 13.

 secB = 13 5

Look at the following right triangle, where:
a = 4
b = 6
Find the secant of angle A

The secant of angle A is =
(round the solution to hundredths)