Quiz about Angoli associati

Question 1

$$sen\left(-\alpha\right)+sen\left(\pi-\alpha\right)=?$$

Accepted Answer

$$0$$

Answer

$$sen\alpha$$

Answer

$$\cos\alpha$$

Answer

$$1$$

Question 2

$$\sin\left(180°\ +\ \alpha\right)$$ =?

Accepted Answer

$$-\sin\left(\alpha\right)$$

Answer

$$\sin\left(\alpha\right)$$

Answer

$$\cos\left(\alpha\right)$$

Answer

$$-\cos\left(\alpha\right)$$

Question 3

$$\cos\left(270°-\alpha\right)=$$

Accepted Answer

$$-\sin\alpha$$

Answer

$$\cos\alpha$$

Answer

$$\sin\alpha$$

Answer

$$-\cos\alpha$$

Question 4

$$tg\left(-\alpha\right)$$ ? (Ricorda: cotan = cotangente = 1/tan)

Accepted Answer

$$- an\left(\alpha ight)$$

Answer

$$\operatorname{cotan}\left(\alpha\right)$$

Answer

$$-\operatorname{cotan}\left(\alpha\right)$$

Answer

$$ an\left(\alpha ight)$$

Question 5

$$sen\left(-\alpha\right)+sen\left(\pi-\alpha\right)=?$$

Accepted Answer

$$0$$

Answer

$$sen\alpha$$

Answer

$$\cos\alpha$$

Answer

$$1$$

Question 6

$$\cos\left(\frac{3}{2}\pi-\alpha\right)=$$

Accepted Answer

$$-sen\alpha$$

Answer

$$sen\alpha$$

Answer

$$\cos\alpha$$

Answer

$$-\cos\alpha$$

Question 7

$$\cos\left(\pi-\alpha\right)=$$

Accepted Answer

$$-\cos\alpha$$

Answer

$$sen\alpha$$

Answer

$$\cos\alpha$$

Answer

$$-sen\alpha$$

Question 8

$$\cos\left(\pi+\alpha\right)=$$

Accepted Answer

$$-\cos\alpha$$

Answer

$$sen\alpha$$

Answer

$$\cos\alpha$$

Answer

$$-sen\alpha$$

Question 9

$$\cos\left(4\pi-\alpha\right)=$$

Accepted Answer

$$\cos\alpha$$

Answer

$$sen\alpha$$

Answer

$$-sen\alpha$$

Answer

$$-\cos\alpha$$

Question 10

$$tg\left(\pi-\alpha\right)=$$

Accepted Answer

$$-tg\alpha$$

Answer

$$tg\alpha$$

Answer

$$\frac{1}{tg\alpha}$$

Answer

$$-\cos\alpha$$

Question 11

$$tg\left(\frac{\pi}{2}+\alpha\right)=$$

Accepted Answer

$$-\frac{1}{tg\alpha}$$

Answer

$$tg\alpha$$

Answer

$$-tg\alpha$$

Answer

$$\operatorname{ctg}\alpha$$

Question 12

$$sen\left(\frac{3}{4}\pi\right)=?$$

Accepted Answer

$$\frac{\sqrt{2}}{2}$$

Answer

$$-\frac{\sqrt{2}}{2}$$

Answer

$$\frac{\sqrt{3}}{2}$$

Answer

$$-\frac{\sqrt{3}}{2}$$

Question 13

$$\cos\left(\frac{5}{4}\pi\right)=?$$

Accepted Answer

$$-\frac{\sqrt{2}}{2}$$

Answer

$$\frac{\sqrt{2}}{2}$$

Answer

$$\frac{\sqrt{3}}{2}$$

Answer

$$-\frac{\sqrt{3}}{2}$$

Question 14

$$tg\left(\frac{5}{6}\pi\right)=?$$

Accepted Answer

$$-\frac{\sqrt{3}}{3}$$

Answer

$$\frac{\sqrt{3}}{3}$$

Answer

$$\sqrt{3}$$

Answer

$$-\sqrt{3}$$

Question 15

$$\sin\left(-\frac{\pi}{3}\right)=...$$

Accepted Answer

$$-\frac{\sqrt{3}}{2}$$

Answer

$$\frac{\sqrt{3}}{2}$$

Answer

$$-\frac{1}{2}$$

Answer

$$\frac{1}{2}$$

Question 16

$$\cos\left(-\ \frac{\pi}{6}\right)=...$$

Accepted Answer

$$\frac{\sqrt{3}}{2}$$

Answer

$$-\frac{\sqrt{3}}{2}$$

Answer

$$-\frac{1}{2}$$

Answer

$$\frac{1}{2}$$

Question 17

$$sen\left(\pi\right)+\cos\left(\pi\right)+tg\left(\pi\right)=?$$

Accepted Answer

$$-1$$

Answer

$$1$$

Answer

$$0$$

Answer

$$2$$

Question 18

$$sen\left(\frac{\pi}{4}\right)+\cos\left(\frac{\pi}{4}\right)+tg\left(\frac{\pi}{4}\right)=?$$

Accepted Answer

$$\sqrt{2}+1$$

Answer

$$\sqrt{2}$$

Answer

$$\sqrt{2}-1$$

Answer

$$-1$$

Question 19

$$sen\left(\frac{5}{6}\pi\right)+2\cdot\cos\left(\frac{7}{6}\pi\right)=?$$

Accepted Answer

$$\frac{1}{2}-\sqrt{3}$$

Answer

$$\frac{1}{2}+\sqrt{3}$$

Answer

$$1-\sqrt{3}$$

Answer

$$1+\sqrt{3}$$

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