Question

cos ( 2cos^-1 x + sin^-1 x) at x= 1/7 = ?

Answer 1

cos ( cos^-1 1/7+ cos^-1 1/7 + sin^-1 1/7)

Answer 2

=cos ( cos^-1 1/7 + pie/2)

Answer 3

It seems wrong (IMHO of course, may be not...)

Answer 4

cos (cos^ -1 1/7) cos pie/2 - sin (cos^ -1 1/7) sin pie/2

Answer 5

cos pi/2 = 0

Answer 6

sin x = sqrt(1-cos^2 x) ..maybe this helps..

Answer 7

Is this correct

Answer 8

0 - sin ( pie/2 - sin^-1 1/7)

Answer 9

use this, u will get it sin^-1 t + cos^-1 t =pi/2

Answer 10

-sin (cos^ -1 1/7)

= - sqrt ( 1- cos(cos-1 (1/7) ^2 ) )
= -sqrt ( 1- 1/49)

was that right ?

Answer 11

how does sqrt come into picture ??

Answer 12

i didnt Understand hw u reached here

Answer 13

just to eliminate the inverse term,i used sinx = sqrt(1- cos^2 x) ..

Answer 14

The answer is correct

Answer 15

lol....Yes....)...thxxxx

Answer 16

-4sqrt3/7

Answer 17

yep..the very same..