4TH PERIODICAL TEST (BASIC CALCULUS)

$$2x^3$$

$$\frac{1}{x^2}$$

$$-\frac{2}{x}$$

$$-\frac{4}{x^3}$$

None of these.

$$360x^3$$

0

$$-1080x^2$$

$$-18x^5$$

None of these.

$$\left(n-1\right)x^{\left(n-2\right)}$$

$$nx^{\left(n-1\right)}$$

$$\left(n-1\right)x^n$$

$$nx^{\left(n-2\right)}$$

None of these.

$$40x-15$$

$$20x^2-15x$$

$$20x-5$$

$$20x$$

None of these.

$$\cos\ x$$

$$\sin\ x$$

$$-\cos\ x$$

$$-\sin\ x$$

None of these.

$$16e^{2x}$$

$$8e^{2x}$$

$$4e^{2x}$$

$$-4e^{2x}$$

None of these.

$$-\csc x\$$

$$\sin x$$

$$\cot\ x$$

$$\sec\ x$$

None of these.

$$2\left(5-2x\right)\left(-3\right)$$

$$2\left(5-3x\right)-3$$

$$\left(5-3x\right)^2\left(-3\right)\left(2\right)$$

$$\left(5-3x\right)\left(10\right)$$

None of these

$$\frac{3}{x}$$

$$\frac{9}{x^2}$$

$$-\frac{3}{x^2}$$

$$-\frac{x^2}{3}$$

None of these

0

$$\infty$$

the constant itself

1

None of these