Introduction To Trigonometry
NIOS · Class 10 · Maths
All formulas from Introduction To Trigonometry in NIOS Class 10 Maths. Key equations, constants, and identities for board exam preparation.
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Basic Trigonometric Ratios
sin θ = opposite/hypotenuse
cos θ = adjacent/hypotenuse
tan θ = opposite/adjacent = sin θ/cos θ
cosec θ = 1/sin θ = hypotenuse/opposite
sec θ = 1/cos θ = hypotenuse/adjacent
Fundamental Trigonometric Identities
sin²θ + cos²θ = 1
sec²θ - tan²θ = 1
cosec²θ - cot²θ = 1
Complementary Angles
sin(90° - θ) = cos θ
cos(90° - θ) = sin θ
tan(90° - θ) = cot θ
cot(90° - θ) = tan θ
sec(90° - θ) = cosec θ
Problem Solving Strategies
a² + b² = c²
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