In a $△ABC$, $\sin 2A+\sin 2B+\sin 2C=$

Important Questions on Measurement of Angles and Trigonometric Functions

EASY

RRC Group D CBT

IMPORTANT

RRB Indian Railway Group 'D' Recruitment - General Mathematics>Chapter 9 - Measurement of Angles and Trigonometric Functions>Exercise 1>Q 27

$\log \tan 0^o+\log \tan 2^o+\cdots +\log \tan {89}^o$.

EASY

RRC Group D CBT

IMPORTANT

RRB Indian Railway Group 'D' Recruitment - General Mathematics>Chapter 9 - Measurement of Angles and Trigonometric Functions>Exercise 1>Q 28

$4\cos {36}^o+\cot 7{\frac{1}{2}}^o=$

EASY

RRC Group D CBT

IMPORTANT

RRB Indian Railway Group 'D' Recruitment - General Mathematics>Chapter 9 - Measurement of Angles and Trigonometric Functions>Exercise 1>Q 29

From the top of the lighthouse, the angles of depression of two stations on opposite sides of it at a distance '$a$' apart are $\alpha$ and $\beta$. The height of the lighthouse is:

EASY

RRC Group D CBT

IMPORTANT

RRB Indian Railway Group 'D' Recruitment - General Mathematics>Chapter 9 - Measurement of Angles and Trigonometric Functions>Exercise 1>Q 30

If $\sin \theta , \cos \theta$ and $\tan \theta$ are in geometric progression then $co{t}^6\theta -co{t}^2\theta =$

EASY

RRC Group D CBT

IMPORTANT

RRB Indian Railway Group 'D' Recruitment - General Mathematics>Chapter 9 - Measurement of Angles and Trigonometric Functions>Exercise 1>Q 31

$\cos 1^o\cos 2^o\cos 3^o\dots \cos {179}^o=$

EASY

RRC Group D CBT

IMPORTANT

RRB Indian Railway Group 'D' Recruitment - General Mathematics>Chapter 9 - Measurement of Angles and Trigonometric Functions>Exercise 1>Q 32

The value of ${\sin }^2{5}^o+{\sin }^2{10}^o+{\sin }^2{15}^o+\dots +\cdots +{\sin }^2{85}^o+{\sin }^2{90}^o=$

EASY

RRC Group D CBT

IMPORTANT

RRB Indian Railway Group 'D' Recruitment - General Mathematics>Chapter 9 - Measurement of Angles and Trigonometric Functions>Exercise 1>Q 33

The value of $\frac{\cot {54}^o}{\tan {36}^o}+\frac{\tan {20}^o}{\cot {70}^o}=$

MEDIUM

RRC Group D CBT

IMPORTANT

RRB Indian Railway Group 'D' Recruitment - General Mathematics>Chapter 9 - Measurement of Angles and Trigonometric Functions>Exercise 1>Q 34

If $\sin x+{\sin }^{2}x+{\sin }^{3}x=1$ then ${\cos }^{6}x-4{\cos }^{4}x+8{\cos }^{2}x=$