Prove and apply multi-angle trigonometric identities up to angles of 4θ using the identities listed above, e.g. cos(4θ) = 8 cos⁴(θ) − 8 cos²(θ) + 1 and cosec(2θ) − cot(2θ) = tan(θ).
u2-t4-s3-d6
Request an applet
Describe what students should see or notice. That's the cue to build — requests are what get built next.