Question

If a have cosx=0.9 what's the value of x?

Answer 1

it's not correct

Answer 2

i already have the answer and it's 15. but i need to now how to i find that value?

Answer 3

know*

Answer 4

A cosine of 0.9 requires an argument rather near x = 0.

You should have an inverse cosine button on your calculator, no?

Answer 5

@ada05it can never be 15.

Answer 6

cos 15=0.96.......

Answer 7

i think it's 25, 84..... that's what i get on my calc ... maybe they wrote it wrong in the book

Answer 8

cos x = 0.9
x = cos^-1(0.9) N.B cos^-1 means cos inverse
x = 25.84 degree

Answer 9

thanks

Answer 10

u welcome