Question

Which of the following choices is a simplification of sin 60°cos15°-sin15°-cos60°?

Answer 1

can someone please help me with this

Answer 2

use the values here...
http://www.embeddedmath.com/downloads/files/unitcircle/unitcircle-letter.pdf

Answer 3

the x - coordinates are the cosine of the angle,
the y- coordinates are the sine of the angle

Answer 4

Each point on the circle radius 1 is ( cos(theta) , sin(theta) )

Answer 5

so in this case, i feel like c (the third answer) is the right one? Is it correct?

Answer 6

didnt calculate.. umm

Answer 7

hint:

sin(A - B) = sin(A)cos(B) - cos(A)sin(B)

Answer 8

yea i'm having trouble to convert, it seems like the 3rd answer to me

Answer 9

ah i just about to say the sum formula

Answer 10

Is that a minus though after sin(15)

Answer 11

I think the original problem should be sin 60°cos15°-sin15°cos60°

Answer 12

yea

Answer 13

could it be #A?

Answer 14

Apply that sum formula first, here is a cheat sheet to remember properties and identities

Answer 15

JIm was correct, the original question is like what he said, it was a typo

Answer 16

yea, so apply this rule...

sin(A - B) = sin(A)cos(B) - cos(A)sin(B)

Answer 17

since the question is exactly th eform of that right side

Answer 18

sin(60 - 15) =
sin(45)

Answer 19

root 2 over 2

Answer 20

I will go through your sugguested process again to confirm, thank you so much!

Answer 21

yeah, just have to recognize that form to simplify it with the identity thing,
Either way, you could have just subbed all 4 values in and it would come out the same

Answer 22

sorry idk i wish i could help doe

Answer 23

love u

Answer 24

wrong person

Answer 25

new phone who dis

Answer 26

u should go on pathway

Answer 27

it rally helps