Answer

Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

Updated On: 2-3-2021

Apne doubts clear karein ab Whatsapp par bhi. Try it now.

CLICK HERE

Loading DoubtNut Solution for you

Watch 1000+ concepts & tricky questions explained!

7.4 K+

2.6 K+

Transcript

Time | Transcript |
---|---|

00:00 - 00:59 | hello students in this question is given as prove that Cos A + cos b whole square + Sin A minus sin square is equals to 4 cos square A + B is the formula of cos A + cos B and his Sin A minus sin we know that Cos A + cos B is twice of Cos A + B by 2 cos a minus b by 2 whole square + A minus sin twice of cost of A + B by 2 into Sin of a minus b by a 9 letter simplify this further 10000 alice's ok so this will come out to be a 4 cos square |

01:00 - 01:59 | B by 2 into cos square B by 2 + cos square A + B by 2 into sin square A minus B by 2 ok now if I take 4 cos square A + B by 2 common what I get cos square B by 2 + sin square A minus B by 2 ok we know that cos square theta + sin square theta is one so this is one will come out to be asked for cos square A + B by 2 ok which is equals to are ok thank you |