Download the app

Questions  

The solution of tanx+tan2x+tan3x=tanxtan2xtan3x is 

a
x=nπ,n∈I
b
x=nπ2,n∈I
c
x=nπ3,n∈I
d
None of these

detailed solution

Correct option is C

we know that,  tan⁡3x=tan⁡(x+2x)=tan⁡x+tan⁡2x1−tan⁡xtan⁡2x⇒    tan⁡3x−tan⁡xtan⁡2xtan⁡3x=tan⁡x+tan⁡2x⇒    tan⁡xtan⁡2xtan⁡3x=tan⁡3x−tan⁡x−tan⁡2x… (i)  Now,     tan⁡x+tan⁡2x+tan⁡3x=tan⁡xtan⁡2xtan⁡3x⇒    tan⁡x+tan⁡2x+tan⁡3x=tan⁡3x−tan⁡x−tan⁡2x⇒    [ from Eq. (i)] ⇒    2x=nπ+(−x)⇒3x=nπ⇒    x=nπ3, where n∈I

Talk to our academic expert!

+91

Are you a Sri Chaitanya student?


Similar Questions

The general solution of sin x - 3sin 2x + sin 3x = cos x -3cos 2x + cos 3x is


phone icon
whats app icon