If $\cos \left(\alpha +\beta \right)=0,$ then $\sin (\alpha -\beta )$ can be reduced to:

Important Questions on Introduction to Trigonometry

MEDIUM

10th CBSE

IMPORTANT

DINESH LAB MANUAL IN MATHEMATICS CLASS X>Chapter 8 - Introduction to Trigonometry>MCQs (MULTIPLE CHOICE QUESTIONS)>Q 65

If $x=2{\sin }^2\theta , y=2{\cos }^2\theta +1$, then the value of $x+y$ is:

MEDIUM

10th CBSE

IMPORTANT

DINESH LAB MANUAL IN MATHEMATICS CLASS X>Chapter 8 - Introduction to Trigonometry>MCQs (MULTIPLE CHOICE QUESTIONS)>Q 66

In the adjoining figure, if $\mathrm{D}$ is mid-point of $\mathrm{BC}$, then the value of $\frac{\tan x°}{\tan y°}$ is

MEDIUM

10th CBSE

IMPORTANT

DINESH LAB MANUAL IN MATHEMATICS CLASS X>Chapter 8 - Introduction to Trigonometry>MCQs (MULTIPLE CHOICE QUESTIONS)>Q 67

If $\cos 3\theta =\frac{\sqrt{3}}{2}; 0<\theta <20°$, then the value of $\theta$ is: 

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10th CBSE

IMPORTANT

DINESH LAB MANUAL IN MATHEMATICS CLASS X>Chapter 8 - Introduction to Trigonometry>MCQs (MULTIPLE CHOICE QUESTIONS)>Q 68

Expressing $\sin A$ in terms of $\cot A$ is

EASY

10th CBSE

IMPORTANT

DINESH LAB MANUAL IN MATHEMATICS CLASS X>Chapter 8 - Introduction to Trigonometry>MCQs (MULTIPLE CHOICE QUESTIONS)>Q 69

The value of ${\sin }^{2}30°+{\cos }^{2}45°+{\cos }^{2}30°$ is

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10th CBSE

IMPORTANT

DINESH LAB MANUAL IN MATHEMATICS CLASS X>Chapter 8 - Introduction to Trigonometry>MCQs (MULTIPLE CHOICE QUESTIONS)>Q 70

If $\tan 2A=\mathrm{c}\mathrm{o}\mathrm{t}(A-18°)$, then the value of $A$ is

MEDIUM

10th CBSE

IMPORTANT

DINESH LAB MANUAL IN MATHEMATICS CLASS X>Chapter 8 - Introduction to Trigonometry>MCQs (MULTIPLE CHOICE QUESTIONS)>Q 71

If $\sin \theta =\frac{1}{2}$, then the value of $\sin \theta (\sin \theta -\mathrm{cosec}\theta )$ is

EASY

10th CBSE

IMPORTANT

DINESH LAB MANUAL IN MATHEMATICS CLASS X>Chapter 8 - Introduction to Trigonometry>MCQs (MULTIPLE CHOICE QUESTIONS)>Q 72

The value of $\sin \theta \cos \left(90°-\theta \right)+\cos \theta \sin \left(90°-\theta \right)$ is: