Question

Use even and odd properties of the trigonometric functions to find the exact value of the expression. sin(-pi/6)

Answer 1

do you know the sin(pi/6) ? or sin(30 degrees) ?

Answer 2

sin(30) is 1/2

Answer 3

I think they want you to use the idea that
sin(-x) = - sin(x)

in this case, if you know sin(30 deg) you can find the sin(-30 deg)

Answer 4

in other words, sin(-30)= - sin(30)

Answer 5

-1/2

Answer 6

yes

Answer 7

but when i use the calculator i get 9.138395397x10^-3 for sin(pi/6)

Answer 8

that is because pi/6 is understood to be in radians
either put your calculator in "radian mode"
or leave your calculator in "degree mode" and change pi/6 radians to degrees

you change from radians to degrees by multiplying by 180/pi

Answer 9

my calculator is in degree mode

Answer 10

yes. so you have to give it angles in degrees

Answer 11

ohh thnxs got confused but u made it clear thnxs