Question

sec(x) = -3. pi 14 years ago

Answer 1

isn't x = y???

Answer 2

nops..you'll have to bring it under its domain,
the domain of cos^-1 x is [0,pi]

the given domain is (pi,2pi)

you need to convert that thing..

Answer 3

how??

Answer 4

wait is it 2pi - y??

Answer 5

you had'cos x = -1/3

now, pi<x<2pi
=> 0 < x -pi < pi

now,,

-cos x = 1/3
cos(pi- x) = cos(x-pi)=1/3
x-pi = cos^(1/3)

note that you can use inverse here since angle is inside domain

y= cos^-1 ( -1/3)

y= pi - cos^-1 (1/3)
y= pi- (x-pi)

y = 2pi-x

Answer 6

long story cut short..yes you were right! :P

Answer 7

AHAA.