0

Guest

Courses New

Q1)If in a triangle, a= 6, b= 3 and cos(A-B)=4/5, then find its area? Q2)Let the angles of a A,B,C of a triangle ABC be in A.P.and let b:c=under root(3):under root(2).Find the angle A?

Q1)If in a triangle, a= 6, b= 3 and cos(A-B)=4/5, then find its area?
Q2)Let the angles of a A,B,C of a triangle ABC be in A.P.and let b:c=under root(3):under root(2).Find the angle A?

Grade:11

1 Answers

Arjun Blouria
14 Points
11 years ago

cos(A-B)=4/5

therefore,    1-tan2(A-B)/2  = 4/5 

                 1+tan2(A-B)/2

By componendo dividendo,

2tan2(A-B) =  5-4

     2             5+4

 

 

 

 

 

 

 

 

 

 

 

Think You Can Provide A Better Answer ?

Other Related Questions on Trigonometry

View all Questions »

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