Trigonometry (4) Flashcards
What is sin(A+-B)
sinAcosB +- cosAsinB
sinAcosB +- cosAsinB
What is sin(A+=B)
What is cos(A+-B)?
sinAsinB -+ cosAcosB
sinAsinB -+ cosAcosB
What is cos(A+-B)?
What is tan(A+-B)?
(tanA+-tanB)/(1-+tanAtanB)
(tanA+-tanB)/(1-+tanAtanB)
What is tan(A+-B)?
What is sin 2A?
2 sin A cos A
2 sin A cos A
What is sin 2A?
What is cos 2A?
cos^2 A - sin^2 A
2 cos^2 A - 1
1 - 2 sin^2 A
cos^2 A - sin^2 A
2 cos^2 A - 1
1 - 2 sin^2 A
What is cos 2A?
What is tan 2A?
(2 tan A)/(1 - tan^2 A)
(2 tan A)/(1 - tan^2 A)
What is tan 2A?
What is (cos^2pheta/cos^2pheta) + (sin^2pheta/cos^2pheta)?
1/cos^2pheta
1/cos^2pheta
What is (cos^2pheta/cos^2pheta) + (sin^2pheta/cos^2pheta) divided by cos^2pheta?
What is (cos^2pheta/sin^2pheta) + (sin^2pheta/sin^2pheta)?
1/sin^2pheta
1/sin^2pheta
What is (cos^2pheta/sin^2pheta) + (sin^2pheta/sin^2pheta)?
Solve 4sinx + 5cosx = 0
(4sinx/cosx) + (5cosx/cosx) = 0
4tanx + 5 = 0
4tanx = -5
tanx = -5/4
Solve sin(x-35degrees) = cosx
cos(x - 125) = cosx
x - 125 = -x
2x = 125
x = 62.5
x + 180 = 242.5
{62.5, 242.5}Solve cos(x+60degrees) = sinx
cos(x+60) = cos(-x+90)
x+60 = -x+90
2x = 30
x = 15
x + 180 = 195
{15, 195}What’s another way of writing sin^2x
(1/2)(1 - cos 2x)
(1/2)(1 - cos 2x)
What’s another way of writing sin^2x
What’s another way of writing (cos^2)5x
(1/2)(cos10x + 1)
