Question

using 15degrees=45degrees-30 degrees what would be the sin, cos and tan of 15 degrees?

Answer 1

sin(a+ -b) = sin(a)cos(-b) + sin(-b)cos(a)

cos(a+ -b) = cos(a)cos(-b)-sin(a)sin(-b)

and tan = sin/cos

Answer 2

tan(a+b)

tan(a)tan(b)
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1+tan(a)tan(b) maybe

Answer 3

sin(45-30)=sin45cos30-cos45sin30
cos(45-30)=cos45cos30+sin45sin30

Answer 4

whats a and b?

Answer 5

a and b are representative of whatever angles you are working with. In this case a is 45 and b is 30

Answer 6

yep

Answer 7

well, i went ahead and used -b for -30

Answer 8

otherwise Im sure I would have messed up the operation in the middle :)

Answer 9

got it

Answer 10

im having problems with tangent