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• The Unit Circle Tests
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# The Unit Circle Tests

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Current: Signs of trigonometric function
•  Q1: 1 pts Use the unit circle to determine the sign of $sin50^\circ$
 positive negative
•  Q2: 1 pts Use the unit circle to determine the sign of $\cos130^\circ$
 positive negative
•  Q3: 1 pts Use the unit circle to determine the sign of $\tan220^\circ$
 positive negative
•  Q4: 2 pts Which of following has positive sign.
 $\sin300^\circ$ $\cos300^\circ$ $\tan300^\circ$ $\cot300^\circ$
•  Q5: 2 pts Use the unit circle to determine the sign of $\sin(-100^\circ)$
 positive negative
•  Q6: 2 pts Use the unit circle to determine the sign of $\cot(-210^o)$.
 positive negative
•  Q7: 2 pts In which quadrant do the most trigonometric functions have positive signs?
 first second third fourth
•  Q8: 3 pts In which quadrant two trigonometic functions have negative signs?
 first second third fourth
•  Q9: 3 pts If $\sin(\alpha)<0$ and $\cos(\alpha)>0$ than the angle $\alpha$ belongs to:
•  Q10: 3 pts If $\tan(\alpha)<0$ and $\sin(\alpha)>0$ than the angle $\alpha$ belongs to:
 $\sin({\frac{4\pi}3})$ $\cos({-\frac{\pi}3})$ $\tan({\frac{5\pi}4})$
•  Q12: 3 pts Which value in the following group has different sign than $\tan({\frac{2\pi}3})$?
 $\cos({\frac{2\pi}3})$ $\sin({\frac{2\pi}3})$ $\cot({\frac{2\pi}3})$