$\pm 45°$

$\pm 135°$

$135°$

none of them

$\frac{a-b}{1+ab}$

$\frac{a+b}{1-ab}$

$\frac{2ab}{a^2+b^2}$

None of these

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

2

$\frac{1}{2}\left(\sqrt{3}+1\right)$

None of these

$\sqrt{3}$

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

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

None of these

2

-1

2

None of these

4 sq. unit

6 sq. unit

8 sq. unit

None of these

$\frac{1}{\sqrt{5}}$

4

$4\sqrt{5}$

None of these

$12\sqrt{2} Unit$

$12 Unit$

$3 Unit$

None of these

512/3 sq. Unit

128 sq. Unit

128/3 sq. Unit

None of these

$-\frac{\mathrm{\pi }}{2}$

$\frac{\mathrm{\pi }}{2}$

None of these

$e^x sec x+c$

$e^x cosec x+c$

$e^x \tan x+c$

None of these

${10}^{\log \sin x}\log {10}^{\cos x}$

${10}^{\log \sin x}{{\log }_e}^{101{/}_{\sin x}}$

${10}^{\log \sin x}{{\log }_e}^{10}$

None of these

$2\sqrt{3}N$

12N

2N

None of these

$\frac{\left(-1\right)n!a^{n-1}}{{\left(ax+b\right)}^n}$

$\frac{{\left(-1\right)}^{n-1}\left(n-1\right)1a^n}{{\left(ax+b\right)}^n}$

$\frac{{\left(-1\right)}^{n-1}\left(n-1\right)1a^n}{{\left(ax+b\right)}^n}$

None of these

10 kg

5 kg

11 kg

None of these

126 kg

63 kg

84 kg

None of these

37.8 m/s

67.8 m/s

38.7 m/s

None of these

$\frac{u^2}{2g}$

$\frac{u^2}{\sqrt{2g}}$

${\left(\frac{u}{\sqrt{g}}\right)}^2$

None of these

380

600

600 N

None of these

12 units

8 units

4 units

None of these

10011

101101

1001101

None of these

2/3

4/3

1/3

None of these

-a+b=0

a+b+1=0

a-b+1=0

None of these

9

-6

-9

None of these

$\theta =0°$

$\theta =45°$

$\theta =0° and 45°$

None

$\frac{{}^{3}C_2\times {}^{4}C_1}{{}^{6}P_1}$

$\frac{{}^{2}P_2\times {}^{4}P_2}{{}^{6}C_1}$

$\frac{{}^{2}C_2\times {}^{4}C_1}{{}^{6}C_1}$

None

$21504x^{10}$

21054

21540

None of these

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

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

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

None

10

13

7

None of these

1

2

+2

None of these