Trigonometry
Class 11

Double Angle Formula - Sine

sin2θ=2sinθcosθ\sin 2\theta = 2\sin\theta\cos\theta
0123456−1−0.500.51
sin(2θ) = 2×sinθ×cosθ

Sine of double angle. Derived from sin(A+B) with A=B. Useful for solving equations and simplifying expressions.

Real-World Applications

Projectile range — Maximum range at 45°: R = v₀²×sin(2θ)/g.

Oscillation amplitude — Modulation in signal processing.

Pendulum motion — Large angle corrections in pendulum period.

Sports — Optimal throwing angle for maximum distance.

Acoustics — Harmonic analysis in musical instruments.

Optics — Double refraction calculations.

Electronics — Frequency doubling in signal processing.

Biomechanics — Joint angle analysis in sports science.

Astronomy — Satellite orbit angle calculations.

Engineering — Stress analysis in rotating machinery.

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