Class 11th Trigonometry Formulas Quiz
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Questions and Answers

If sin(A) = 4/5 and A is an acute angle in a right-angled triangle, what is the value of cos(A)?

  • 3/5 (correct)
  • 4/3
  • -3/5
  • -4/3
  • What is the value of sin(-30°)?

  • -1
  • 0.5
  • -0.5 (correct)
  • 1
  • Which of the following identities represents the relationship between sin(A+B) and sinA, sinB, cosA, cosB?

  • sin(A+B) = sinAcosB + sinBcosA
  • sin(A+B) = cosAcosB - sinAsinB
  • sin(A+B) = cosAcosB + sinAsinB (correct)
  • sin(A+B) = sinAcosB - sinBcosA
  • If cot(X) = -3/4, what is the value of tan(-X)?

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    What is the value of sin2(45°)?

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    Study Notes

    Trigonometric Identities and Values

    • If sin(A) = 4/5 and A is an acute angle in a right-angled triangle, then cos(A) = √(1 - (4/5)^2) = 3/5
    • The value of sin(-30°) is -1/2
    • The relationship between sin(A+B) and sinA, sinB, cosA, cosB is sin(A+B) = sinAcosB + cosAsinB
    • If cot(X) = -3/4, then tan(-X) = 1/(-3/4) = -4/3
    • The value of sin2(45°) is sin(2*45°) = sin(90°) = 1

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    Description

    Test your knowledge of trigonometry formulas with this quiz covering sine, cosine, tangent, cotangent, secant, cosecant, and various trigonometric identities.

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