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Question

How do I find the value of sin-30°.


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Solution

Calculate the value of sin-30°:

First, determine the sign of sin-30°.

It is clear that 30° belongs to the first quadrant.

It is known that the values of sines are positive + in the first quadrant.

It is also known that, sin(-x°)=-sin(x°).

Thus, sin-30°=-sin30°=-12.

Therefore, the value of sin-30° is -12.


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