Math, asked by unnatisahu2415, 1 month ago

find value of cos 2 theta when cos theta = – 3/5

Attachments:

Answers

Answered by GauthmathMagnus

1

Answer:

-7/25

Step-by-step explanation:

we know that cos2theta=2cos^2theta-1

so cos2theta=2(-3/5)^2-1

=2(9/25)-1)

=-7/25

Previous Question

Next Question

Similar questions

Math, 16 days ago

the number of numbers between 100 and 1000 which are divisible by 7...

Math, 16 days ago

1 2. There was a 12-% increase in the number 2 of new admissions to a school in 2012 compared to the year 2011. If the number of new admissions in 2011 was 112, find the number of new admissions in 2012.

Science, 16 days ago

Give reason: ■ Submerged plants have no stomata. ■ Mangrove develops Aerial roots. ■ Water hyacinth has spongy and hollow stem. ■ Rose Shrubs cannot be grown in desert. ■ Mushrooms are not plants???

English, 1 month ago

what is ecosystem?what are the effects??

Computer Science, 1 month ago

software that is a specially designed for a particular organisation or user is...

English, 9 months ago

If I had been there, there would not have been any quarrel A Have I been there, there would not been any quarrel B Had I there, there would not have been any quarrel C Had I been there, there would not have been any quarrel D Had Inot been there, there would not have been any ...

Math, 9 months ago

(vi) (√7- 6) (√3 -√7) ...

Chemistry, 9 months ago

Which of the following metals does not react with cold water to produce hydrogen gas?