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

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