UNIT CIRCLE Circular Functions (Page 7 of 10)

To find the tangent of 5π/6, divide y by x. To find the cotangent, divide x by y. The values of x and y from the graph are currently stored in these variables, so the variables can be used to perform calculations.

 2nd QUIT key. CLEAR key.

 ALPHA key. ALPHA Y key. Divide key. ALPHA key. ALPHA X key. ENTER key.
 ALPHA key. ALPHA X key. Divide key. ALPHA key. ALPHA Y key. ENTER key.

 Calculator screen image.

You can see that tan(5π/6 ) is approximately -0.5774 and cot(5π/6 ) is approximately -1.7321. Finally, the secant of 5π/6 will be the reciprocal of x, and the cosecant will be the reciprocal of y. To compute the reciprocal, use the x to the -1 key. key immediately after the variable.
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