ট্রিগনোমেট্রি: সাইন, কসাইন, ট্যানজেন্ট এবং আইডেন্টিটি
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Questions and Answers

একটি সমকোণী ত্রিভুজের বিপরীত দিক ও হাইপোটিনিউসের অনুপাত কি?

সাইন

সমকোণী ত্রিভুজের পাইথাগোরাস সূত্র কি?

sin^2(A) + cos^2(A) = 1

যদি sin(x) = 1/2, তাহলে x এর মান কি?

π/6 বা 30°

Tan(A + B) এর সূত্র কি?

<p>(tan(A) + tan(B)) / (1 - tan(A)tan(B))</p> Signup and view all the answers

যদি arctan(x) = θ, তাহলে tan(θ) এর মান কি?

<p>x</p> Signup and view all the answers

Study Notes

Trigonometry

Sine, Cosine, and Tangent

  • Sine (sin): ratio of the opposite side to the hypotenuse in a right-angled triangle
    • sin(A) = opposite side / hypotenuse
  • Cosine (cos): ratio of the adjacent side to the hypotenuse in a right-angled triangle
    • cos(A) = adjacent side / hypotenuse
  • Tangent (tan): ratio of the opposite side to the adjacent side in a right-angled triangle
    • tan(A) = opposite side / adjacent side

Trigonometric Equations

  • Types of trigonometric equations:
    • Simple trigonometric equations: involve a single trig function (e.g., sin(x) = 1/2)
    • Compound trigonometric equations: involve multiple trig functions (e.g., sin(x) + cos(x) = 1)
  • Solving trigonometric equations:
    • Use inverse trig functions (e.g., arcsin, arccos, arctan) to find solutions
    • Use algebraic methods (e.g., substitution, factoring) to simplify and solve equations

Inverse Trigonometric Functions

  • Inverse sine (arcsin or sin^(-1)): returns the angle whose sine is a given value
    • arcsin(x) = θ, where sin(θ) = x
  • Inverse cosine (arccos or cos^(-1)): returns the angle whose cosine is a given value
    • arccos(x) = θ, where cos(θ) = x
  • Inverse tangent (arctan or tan^(-1)): returns the angle whose tangent is a given value
    • arctan(x) = θ, where tan(θ) = x

Trigonometric Identities

  • Pythagorean Identity:
    • sin^2(A) + cos^2(A) = 1
  • Sum and Difference Formulas:
    • sin(A + B) = sin(A)cos(B) + cos(A)sin(B)
    • cos(A + B) = cos(A)cos(B) - sin(A)sin(B)
    • tan(A + B) = (tan(A) + tan(B)) / (1 - tan(A)tan(B))
  • Double-Angle Formulas:
    • sin(2A) = 2sin(A)cos(A)
    • cos(2A) = cos^2(A) - sin^2(A)
    • tan(2A) = (2tan(A)) / (1 - tan^2(A))

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ট্রিগনোমেট্রির মৌলিক ধারণা, সাইন, কসাইন, ট্যানজেন্ট, ট্রিগনোমেট্রিক সমীকরণ, আইডেন্টিটি এবং অন্যান্য বিষয় নিয়ে কুইজ।

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