Difference between revisions of "Remember the Trigonometric Table"
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Did you ever have any trouble remembering the sine or tangent of an angle? This article explains how you can easily find the basic trigonometric numbers of the most common angles. | Did you ever have any trouble remembering the sine or tangent of an angle? This article explains how you can easily find the basic trigonometric numbers of the most common angles. | ||
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== Steps == | == Steps == | ||
#Create a table.<br><br> In the first row, write down the trigonometric ratios (sin, cos, tan, cot). <br><br>In the first column, write down the angles (0°, 30°, 45°, 60°, 90°).<br><br> Leave other entries blank. | #Create a table.<br><br> In the first row, write down the trigonometric ratios (sin, cos, tan, cot). <br><br>In the first column, write down the angles (0°, 30°, 45°, 60°, 90°).<br><br> Leave other entries blank. | ||
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# Fill in the cotangent column.<br><br>Simply copy the entries in tangent column in reverse order into the cot column. This is valid because tan x° = sin x° / cos x° = cos (90-x)° / sin (90-x)° = cot (90-x)° for any x. | # Fill in the cotangent column.<br><br>Simply copy the entries in tangent column in reverse order into the cot column. This is valid because tan x° = sin x° / cos x° = cos (90-x)° / sin (90-x)° = cot (90-x)° for any x. | ||
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== Tips == | == Tips == | ||
