1
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+2
-0

If $$\alpha=3 \sin ^{-1} \frac{6}{11}$$ and $$\beta=3 \cos ^{-1}\left(\frac{4}{9}\right)$$, where the inverse trigonometric functions take only the principal values, then the correct option is

A
$$\cos \beta>0$$
B
$$\sin \beta<0$$
C
$$\cos (\alpha+\beta)>0$$
D
$$\cos \alpha<0$$
2
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+2
-0

$$\text { The value of } \sec ^2\left(\tan ^{-1} 2\right)+\operatorname{cosec}^2\left(\cot ^{-1} 3\right) \text { is }$$

A
4
B
9
C
2
D
15
3
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+2
-0

The value of $$\tan \left(\frac{\pi}{8}\right)$$ is _________.

A
$$\sqrt{2}-1$$
B
$$1-\sqrt{2}$$
C
$$\sqrt{2}$$
D
$$\sqrt{2}+1$$
4
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+2
-0

A plane is parallel to two lines, whose direction ratios are $$1,0,-1$$ and $$-1,1,0$$ and it contains the point $$(1,1,1)$$. If it cuts co-ordinate axes $$(\mathrm{X}, \mathrm{Y}, \mathrm{Z}$$ - axes resp.) at $$\mathrm{A}, \mathrm{B}, \mathrm{C}$$, then the volume of the tetrahedron $$\mathrm{OABC}$$ is _________ cu. units.

A
9
B
$$\frac{9}{4}$$
C
$$\frac{9}{2}$$
D
27
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