MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

⇐ BackProceed to Checkout ⇒
There are no items in this cart.
Continue Shopping
Menu
Grade: 12 
        
prove the following result
tan^-1(1/4) +tan^-1(2/9)=1/2 sin^-1(4/5)
3 years ago

Answers : (1)

Rinkoo Gupta
askIITians Faculty
80 Points 
							tan-1(1/4)+tan-1(2/9)=tan-1(1/4+2/9)/(1-(1/4)(2/9))
=tan-1(1/2)
=(1/2). 2tan-1(1/2)
=(1/2). tan-1{(2.(1/2))(1-(1/2)2)}
=(1/2).tan-1(4/3)
=1/2 sin-1(4/5)  by using the formula tan-1x=sin-1(x/sqrt(1-x2))

Thanks & Regards
Rinkoo Gupta
AskIITians faculty
3 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

Other Related Questions on Trigonometry

2-sinQ cosQ- cosQ /1-sinQ+ sin2Q-cos2Q =cotQ solve by trigonometrical identities tignometry class 10 Answer & Earn Cool Goodies
if fn(x)=1/n(cos^nx +sin^nx) n=1,2,3........ then value of f4(x)-f6(x) Answer & Earn Cool Goodies
Please s explain the below expression cos¢=9/15, Tan¢=?.
In a ∆ABC, if A = 4π/9 and B = 2π/9 , then a² - b² is equal to please solution
15a= 180 then solve that cosa cos2a cos3a cos4a cos5a cos6a cos7a = ??
View all Questions »
  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: Rs. 15,900
  • View Details


Course Features

  • 731 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution


Course Features

  • 31 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers To Win!!! Click Here for details