No products in the cart.

Cos20.cos40.cos60.cos80=1/16

CBSE, JEE, NEET, CUET

Question Bank, Mock Tests, Exam Papers

NCERT Solutions, Sample Papers, Notes, Videos

Install Now

Cos20.cos40.cos60.cos80=1/16

Posted by Drakshi Chopra 6 years, 8 months ago

CBSE > Class 11 > Mathematics

1 answers

Priya Singh 6 years, 3 months ago

=(1/8)cos80°+(1/8)cos100°+(1/8)cos60°
=(1/8)(cos80°+cos100°)+(1/8)×(1/2)
=(1/8)[{2cos(80°+100°)/2}{cos(80°-100°)/2}]+(1/16)
=(1/8)(2cos90°cos10°)+(1/16)
=0+(1/16) [cos90°=0]
=1/16 (proved)

0Thank You

ANSWER

Related Questions

The difference between compound interest annually and simple interest on a certain sum for 2 years at 10% per annum is Rupees 250 .Find the sum

Posted by Rajpreet Kaur . 1 month ago

CBSE > Class 11 > Mathematics

0 answers

Derivative of cube root of tanx

Posted by Adi Manav 1 month, 1 week ago

CBSE > Class 11 > Mathematics

0 answers

Derivative of cube root of tan x ...

Posted by Ayush Alpha 1 month, 1 week ago

CBSE > Class 11 > Mathematics

0 answers

This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

Few rules to keep homework help section safe, clean and informative.

Don't post personal information, mobile numbers and other details.
Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
Ask specific question which are clear and concise.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

Posted by Not Fine Bro 🎭 1 month ago

CBSE > Class 11 > Mathematics