Trig functions

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Given cos (-3/8) and tan theta < 0 find the values of the secant and tangent

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@audal,

Cos = Adjacent/Hypotenuse =-3/8
Use Pythagoras to get Opposite hence other trig ratios.
e.g. Tan=Opp/Adj

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@audal,

The example on wikipedia uses a 3,4,5 triangle.

Notice that the angle is more than 90 degrees, and that the terminal side of the angle lies in the second quadrant. This will influence the signs of the trigonometric functions.

$http://upload.wikimedia.org/math/3/2/6/32667723d4c10f957f8e6df28af17d9b.png$
$http://upload.wikimedia.org/math/a/b/4/ab406560e178e74ff727d1e03fb57fa8.png$
$http://upload.wikimedia.org/math/1/f/4/1f463727cabe4686fdb531e366a87319.png$

http://en.wikibooks.org/wiki/High_School_Trigonometry/Defining_Trigonometric_Functions

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Trig functions

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