ncert class 10 maths ch2formulas
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the title is here where are the formulas now.
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Algebra and Quadratic Equation Formulas. Arithmetic Progression Formulas.
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Other Trigonometric formulas:
sin(90° – θ) = cos θ
cos(90° – θ) = sin θ
tan(90° – θ) = cot θ
cot(90° – θ) = tan θ
sec(90° – θ) = cosecθ
cosec(90° – θ) = secθ
sin2θ + cos2 θ = 1.
sec2 θ = 1 + tan2θ for 0° ≤ θ < 90°
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