Question 1 Report
If tan θ = 5/4, find sin2θ - cos2θ.
Answer Details
Tan θ = 5/4 x2 = 52 + 42 = 25 + 16 = 41 x = √41 sin2θ - cos2θ = (5/√41)2 - (4/√41)2 = 25/41 - 16/41 = 9/41