Question

if cos inverse x/2+cos inverse y/3=z ,then prove that 9x square-12xy cos z +4y square=36 sin square z

Answer 1

\[\arccos\left(\frac x2\right)+\arccos \left(\frac y3\right)=z\]

Answer 2

\[9x ^2-12xy \cos \left(z +4y ^2\right)=36 \sin ^2( z)\]

Answer 3

like this?

Answer 4

yes . it is..

Answer 5

i bet you have to take a square root at some stage

Answer 6

do arc and inverse,both signify the same thing?

Answer 7

yer

Answer 8

okay.
can you help me in solving out it.at staring of steps?

Answer 9

i dont know what to do

Answer 10

okay.thanks