5 Questions
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
What is the value of sin(-30°)?
-0.5
Which of the following identities represents the relationship between sin(A+B) and sinA, sinB, cosA, cosB?
sin(A+B) = cosAcosB + sinAsinB
If cot(X) = -3/4, what is the value of tan(-X)?
-4/3
What is the value of sin2(45°)?
1
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
Test your knowledge of trigonometry formulas with this quiz covering sine, cosine, tangent, cotangent, secant, cosecant, and various trigonometric identities.
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