Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
292 views
in Trigonometry by (45.0k points)
closed by

If tan α = \(\frac{1}{7},\) tan β = \(\frac{1}{3},\) then cos 2α is equal to

A. sin 2β

B. sin 4β

C. sin 3β

D. cos 2β

1 Answer

+1 vote
by (47.4k points)
selected by
 
Best answer

Correct answer is B.

Now to find the value of cos 2α

The same value is obtained for sin 4β.

[By sin 2x = 2 sinx cosx]

As the value of cos 2α and sin 4α are the same,

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...