lightbulb Key Concepts

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1. Trigonometric Ratios

For a right triangle with angle θ:

• Sine (sin θ): Opposite / Hypotenuse (P/H)
• Cosine (cos θ): Adjacent / Hypotenuse (B/H)
• Tangent (tan θ): Opposite / Adjacent (P/B) = sin θ / cos θ

2. Reciprocal Ratios

• Cosecant (cosec θ): 1 / sin θ = H/P
• Secant (sec θ): 1 / cos θ = H/B
• Cotangent (cot θ): 1 / tan θ = B/P

3. Values for Standard Angles

Ratio	0°	30°	45°	60°	90°
sin	0	1/2	1/√2	√3/2	1
cos	1	√3/2	1/√2	1/2	0
tan	0	1/√3	1	√3	∞