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Enter trigonometric functions (sin, cos, tan, sin-1, cos-1, tan-1), just as you would write them. Set the desired Angle mode before starting trigonometric calculations.
Example
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tan |
p $ $ < - @ 45 E < |
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tan-1 |
% \ 1 E < |
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cos |
5 V ? 60 E < |
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Degree Mode
Example Radian Mode
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tan |
p " < - @ g q 4 " E < |
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tan-1 |
% \ 1 E < |
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n |
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cos |
5 V ? g q 4 " E < |
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n |
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³ Problem
Find angle A of the right triangle below. Then calculate angle B and the length of the hypotenuse c. Lengths are in meters. Round results to one decimal place.
Reminder:
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tan A =
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m±A + m±B + 90° = 180° therefore m±B = 90° - m±A
c = |
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therefore 
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p $ $ " " < |
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- % \ 7 q 3 " E < |
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90 U % i < |
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% b 3 F T 7 F < |
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n |
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To one decimal place, the measure of angle A is 66.8°, the measure of angle B is 23.2°, and the length of the hypotenuse is 7.6 meters.