Revision (Grade 11 NSC Matric Mathematics): Flashcards

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Sine ratio formula

sin⁡α=oppositehypotenuse\sin α = \frac{\text{opposite}}{\text{hypotenuse}}

Cosine ratio formula

cos⁡α=adjacenthypotenuse\cos α = \frac{\text{adjacent}}{\text{hypotenuse}}

Tangent ratio formula

tan⁡α=oppositeadjacent\tan α = \frac{\text{opposite}}{\text{adjacent}}

Positive trig function in Quadrant II (90° to 180°)

Only Sine

Positive trig function in Quadrant III (180° to 270°)

Only Tangent

Value of sin⁡30°\sin 30°

12\frac{1}{2}

Value of cos⁡60°\cos 60°

12\frac{1}{2}

Value of tan⁡45°\tan 45°

11

ASTC rule mnemonic

All Students Take Calculus

When to round in multi-step trig calculations

Keep full accuracy until final answer

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