Which of the following is not equal to sin⁡ (-230°) ?

sin (130°)

-sin (-50°)

sin (50°)

sin (-50°)

sin (-50°) is not equal to sin (-230°)

Step-by-step explanation:

You will be required to use a scientific calculator for this.

Step 1 : Find out the value of sin (-230°)

sin (-230°) = 0.766

Step 2 : Find out all the other values and see if they are 0.766 or not.

sin (130°) = 0.766 (It is equal to sin (-230°))

-sin (-50°) = 0.766 (It is equal to sin (-230°))

sin (50°) = 0.766 (It is equal to sin (-230°))

sin (-50°) = - 0.766 (It is not equal to sin (-230°))

!

sin⁡ (-230°) = sin (50°)

Step-by-step explanation:

1) sin (-a) = - sina

note : 2) sina = sinb : a=b or a+b = 180°

in this exercice:

sin⁡ (-230°) = - sin⁡ (230°) = - sin (-50°) = - (-sin (50°)) = sin (50°) because:

sin⁡ (230°) = sin (-50°) because; 230° + (-50°) = 180°

sin⁡ (230°) = - sin (50°)