Evaluating Trigonometry using a Calculator
We could make use of a scientific calculator to obtain the trigonometric value of an angle. Example: Find the value of cos 6.35˚. Solution: Press
cos 6.35˚ = 0.9939 (correct to 4 decimal places)
Example: Find the value of sin 40˚ 32 ’ . Solution: Press
sin 40˚32 ’ = 0.6499 (correct to 4 decimal places)
Example: Find the value of x for the following triangle. (Give your answer correct to 4 decimal places)
Solution:
x = 6.21 × sin 31.3˚ = 3.2262
The following video shows how to use a calculator to obtain the trigonometric value of an angle.
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