Question

Which expression is equivalent to cos 2 pi for all values of pi?

Answer 1

well you should just check out some trigonmetric formulas for cos, i will give you a hint, look for one with cos^2 x

Answer 2

\[\cos 2 \pi=1\]

Answer 3

Wouldn't it be cos^2pi – 1 ?

Answer 4

\[2\cos^2\pi-1 \implies 1-\sin^2\pi \implies \cos^2\pi-\sin^2\pi\]

Answer 5

yes with the 2 before

Answer 6

2cos^2pi-1

Answer 7

yes. cos(2pie) is equivalent to cos(0) which is equal to "1"

Answer 8

cos2pi + sin2pi
cos2pi – 1
1 – 2 sin2 pi
2 sinpi cospi
are the options

Answer 9

sin(2pi)=0 which makes first option as "cos2pi +0= cos2pi= 1".
Therefore first option is the right one.

Answer 10

1,3 are correct

Answer 11

yup. 1 and 3.

Answer 12

Oh, i see ! thank you :)

Answer 13

i actually have one more question..

Answer 14

post in a new open question tab

Answer 15

i did :)