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Determine the sign of sin 5pi/4 without using a calculator

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2 votes

Final answer:

The sign of sin 5π/4 is negative.

Step-by-step explanation:

To determine the sign of sin 5π/4 without using a calculator, we can use the unit circle. In the unit circle, 5π/4 is in the third quadrant. In the third quadrant, the sine function is negative. Therefore, sin 5π/4 is negative.

User Hugo Yates
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check the picture below.
Determine the sign of sin 5pi/4 without using a calculator-example-1
User The Black Horse
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