Posted by Josh on Monday, October 10, 2011 at 9:32am.
solve this equation on the given interval expressing the solution for x in terms of inverse trigonometric functions.
6(cosx)^2-cosx-5=0 on (pie/2, pie)
Calculus - bobpursley, Monday, October 10, 2011 at 9:37am
Isn't this a quadratic in cosx ?
where y= cos x
then solve for x
Calculus - Reiny, Monday, October 10, 2011 at 9:43am
cosx = (2 ± √124)/12
= -.76129 or 1.09.. , the latter is undefined
x = 2.436 radians
or x = cos^-1 ( (2-√124)/12)
bobpursley is right - Calculus - Reiny, Monday, October 10, 2011 at 9:47am
I misread your equation, should be
x = cos^-1 ( 1 ± √121)/12)
= cos^-1 (-5/6)
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