Thread: Inverse trigonometric functions

Hello ,

solve cosx = 2/7 for x [Pie , 2Pie]

My solution is first : Arc cos ==> 1.28 rd , 1.28/3.14 = 0.4076 Pie its not in the domain so what to do ? I don't know what to do after that ? please can you help me ?

Thanks

Hello, iceman1!

By the way, it's not "pie" . . . it's "pi".

Solve: .

My solution is first: . . ?? . Why?

An inverse trig function has an infinite number of values.

. .


Now find so that the angle falls within the interval.

oh thanks yeah sorry ''PI'' . 1.28/pi to get the result is PI ? coz its in Radian .

anway how to find n ? I need an exemple how to resolve this problem .

our teacher is drawing the circle and i m lost sometimes she adjust -Pi -x , +Pi + x Please can you help me how to know ?

Thanks

Originally Posted by iceman1

oh thanks yeah sorry ''PI'' . 1.28/pi to get the result is PI ? coz its in Radian .

anway how to find n ? I need an exemple how to resolve this problem .

our teacher is drawing the circle and i m lost sometimes she adjust -Pi -x , +Pi + x Please can you help me how to know ?

Thanks

Soroban told you that "
When n is 0, that is 1.281 radians. When n= 1, that is 1.281+ 2(3.141)= 7.563 and 1.281- 2(3.141)= -5.002. When n= 2, ... Do the arithmetic!