Question

the exact value of cos(- pi/4)

Answer 1

1 over sqroot of 2

Answer 2

what would be the value of a,b,c

Answer 3

cos(- π/4) = cos (π /4)
\[=1/\sqrt{2}\]
Rationalise the answer
\[=(1 \times\sqrt{2})/(\sqrt{2} \times \sqrt{2})\]
Can you do it from here?

Answer 4

not too sure

Answer 5

.25

Answer 6

how would you put it in the form i said above?

Answer 7

actually it's 1! my B! it's actully 0.99990604980155050801971795294044 to be exact! concure?

Answer 8

what the value for a,b,c

Answer 9

is it 1 for a, 2 for b, and 2 for c

Answer 10

Continue with my workings:
\[= \sqrt{2} /2\]
Can you get the answer now?

Answer 11

listen to callisto!

Answer 12

i know the answer but i want to know that the values are correct. cause the question only asks for the excat value of the 3 letters in the drawing above!

Answer 13

I got the answer. Thanks guys!

Answer 14

Sorry, i thought you can work it out on your own..