Question

TRUE/FALSE

The value 3pi/16 is a solution for the equation....

Answer 1

\[2\cos ^{2}(4x)-1=0\]

Answer 2

just plug in 3pi/16 in that equation and check whether left side = right side...

Answer 3

whats cos (3pi/4) =... ?

Answer 4

-0.707?

Answer 5

yes, or you can say -1/sqrt 2
so, squaring it we get (1/2)
2 (1/2) -1
does that equal 0 ?

Answer 6

YES!

Answer 7

well, then 3pi/16 is the solution :)

Answer 8

THANKS!!!

Answer 9

welcome ^_^