Quiz about Проверка №1 д/з по алгебре 9 кл. (начало тригонометрии)

Question 1

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

Accepted Answer

$$tg\alpha$$

Answer

$$-tg\alpha$$

Answer

$$\operatorname{ctg}\alpha$$

Answer

$$-\operatorname{ctg}\alpha$$

Question 2

$$tg315\degree=$$

Accepted Answer

Answer

1

Answer

$$\frac{\sqrt[]{2}}{2}$$

Answer

$$\sqrt[]{3}$$

Answer

$$-\sqrt[]{3}$$

Question 3

$$\operatorname{ctg}545\degree=$$

Accepted Answer

$$\operatorname{ctg}5\degree$$

Accepted Answer

$$tg75\degree$$

Answer

$$-\operatorname{ctg}75\degree$$

Answer

$$-\operatorname{ctg}5\degree$$

Answer

$$-tg5\degree$$

Question 4

$$tg^2\left(270\degree+\alpha\right)\cdot\sin^2\left(180\degree+\alpha\right)=$$

Accepted Answer

$$\cos^2\alpha$$

Answer

$$\cos\alpha^2$$

Answer

$$-\cos\alpha$$

Answer

$$\sin^2\alpha$$

Question 5

$$\sin270\degree=$$

Accepted Answer

$$-1$$

Answer

1

Answer

0

Answer

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

Question 6

$$1+tg^2\alpha=$$

Accepted Answer

$$\frac{1}{\cos^2\alpha}$$

Answer

$$-\frac{1}{\cos^2\alpha}$$

Answer

$$\frac{1}{\sin^2\alpha}$$

Answer

$$-\frac{1}{\sin^2\alpha}$$

Question 7

$$\cos\left(2\pi-\alpha\right)=$$

Accepted Answer

$$\cos\alpha$$

Answer

$$-\cos\alpha$$

Answer

$$\sin\alpha$$

Answer

$$-\sin\alpha$$

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