0

Guest

Courses New

1)prove that (cos x)cos(60-x)cos(60+x) = ¼ cos3x 2)sin 2x -sin5x + sin6x = 0

1)prove that (cos x)cos(60-x)cos(60+x) = ¼ cos3x 
2)sin 2x -sin5x + sin6x = 0

Grade:12

1 Answers

Sourabh Singh IIT Patna
askIITians Faculty 2104 Points
7 years ago
Use exopansion property of cos(A+B) and apply
you will get the answer.
Take sin5x on other side and then use the clubbing property of sinA+sinB.

Think You Can Provide A Better Answer ?

Other Related Questions on Trigonometry

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More