Double-Angle and Half-Angle Identities

Front

cos θ = 4/5 and 270° < θ < 360°. Find sin 2θ.

Back

-24/25

Front

Use a double-angle or half-angle identity to find the exact value of tan θ/2 given sin θ = −3/5 and 3π/2 < θ < 2π.

Back

-1/3

Front

Use a double-angle identity to find sin 2θ given cos θ = 4/5 and 270° < θ < 360°

Back

-24/25

Front

Use a double-angle or half-angle identity to find the exact value of sin 2θ given cos θ = 4/5 and 270° < θ < 360°

Back

-24/25

Front

Use a double-angle or half-angle identity to find the exact value of tan θ/2 given sin θ = −3/5 and 3π/2 < θ < 2π.

Back

-1/3

Front

Find the exact value of sin 2x if sin x = 12/13 and x is in the first quadrant.

Back

120/169

Front

Use the information about the angle θ, 0≤θ<2π to find the exact value of sin (2θ) given sin θ= 3/5 , 0<θ<π/2.

Back

24/25

Front

sin2u =

Back

2(sinu)(cosu)

Front

cos2u =

Back

(cosu)^2 - (sinu)^2

Front

If cosx = - 4/5, find secx.

Back

-5/4