Sum to product of two angles
What does, Sin(a)+Sin(B), equal to?
2sin((a+B)/2)cos((a-B)/2)
What does, cos(a)+cos(B), equal to?
2cos(a+B/2)cos(a-B/2)
What does, sin(a)sin(B), equal to?
1/2[cos(a-B)-cos(a+B)]
What does, cos(a)cos(B), equal to?
1/2[cos(a-B)+cos(a+B)]
sin(10x)+sin(5x)
2(sin(15x/2)cos(5x/2))
What does, Sin(a)-Sin(B), equal to?
2cos((a+B)/2)sin((a-B)/2)
What does, cos(a)-cos(B), equal to?
-2sin(a+B/2)sin(a-B/2)
What does, sin(a)cos(B), equal to?
1/2[sin(a+B)+sin(a-B)]
What does, cos(a)sin(B), equal to?
1/2[sin(a+B)-sin(a-B)]
cos(10x)sin(5x)
1/2(sin(15x)+sin(5x))
What identity do you use for this equation?
cos5x+cos3x
cos(a)+cos(B)=2cos((a+B)/2)cos((a-B)/2)
What identity do you use for this equation?
sin(3x)-sin(x)
sin(a)-sin(B)=2cos((a+B)/2)sin((a-B)/2)
What identity do you use for this equation?
-8cos(3x)cos(5x)
cos(a)cos(B)=1/2[cos(a-B)+cos(a+B)]
What indentity do you use for this equation?
Sin(40)Sin(15)
Sin(a)sin(B)=1/2[cos(a-B)-cos(a+B)]
cos(2x/3)+cos(7x/3)
2cos((9x/3)*(1/2))cos((-5x/3)*(1/2))
How do you set this problem up?
cos(5x)+cos(3x)
2cos((5x+3x)/2)cos((5x-3x)/2)
How do you set this problem up?
sin(3x)-sin(x)
2cos((3x+x)/2)sin((3x-x)/2)
How do you set this problem up?
-8cos(3x)cos(5x)
(-8)(1/2[cos(3x-5x)-cos(3x+5x)])
How do you set this problem up?
4Sin(35)cos(15)
(4)(1/2[sin(35+15)+sin(35-15)])
sin(πx/2)sin(5πx/2)
1/2(cos(2πx)-cos(3πx)
How do you set this problem up?
cos(x/2)-cos(5x/2)
-2sin((x/2 + 5x/2)/2)sin((x/2-5x/2)/2)
How do you set this problem up?
sin(3π)/4)(x))+sin(5π)/4)(x))
2sin((3π/4 + 5π/4)/2)cos((3π/4-5π/4)/2)
How do you set this problem up?
cos(10x)sin(5x)
1/2[sin(10x+5x)-sin(10x-5x)]
How do you set this problem up?
sin(40)sin(15)
1/2[cos(40-15)-cos(40+15)]
4(cos(-x)cos(2x))
2(cos(3x)+cos(x))