Cosine - practice problems
Number of problems found: 243
- Complex roots
Find the sum of the fourth square root of the number 16.
- Determine 3882
Determine the sum of the three square roots of 343.
- Scalene triangle
Solve the triangle: A = 50°, b = 13, c = 6
- Greatest angle
Calculate the greatest triangle angle with sides 197, 208, 299.
If the angle α is acute, and cotan α = 1/3. Determine the value of sin α, cos α, and tan α.
- Parallelogram 49383
The parallelogram has the sides a = 25.3 b = 13.8, and the angle closed by the sides is a = 72 °. Calculate the area of the parallelogram.
- Cis notation
Evaluate multiplication of two complex numbers in cis notation: (6 cis 120°)(4 cis 30°) Write the result in cis and Re-Im notation.
- Earth's circumference
Calculate the Earth's circumference of the parallel 48 degrees and 10 minutes.
- Fifth 3871
What is the sum of the fifth root of 243?
- Vector sum
The magnitude of the vector u is 12 and the magnitude of the vector v is 8. The angle between vectors is 61°. What is the magnitude of the vector u + v?
If tg α = 9.6, Calculating sin α, cos α, cotg α .
- Coordinates of square vertices
I have coordinates of square vertices A / -3; 1/and B/1; 4 /. Find coordinates of vertices C and D, C and D. Thanks, Peter.
- One side
One side is 36 long with a 15° incline. What is the height at the end of that side?
The point (3, 4) is on the terminal side of angle θ. cos θ = ...
Calculate the area of the triangle ABC if b = c = 17 cm, R = 19 cm (R is the circumradius).
- Angle between lines
Calculate the angle between these two lines: p: -8x +4y +5 =0 q: 10x +10y -7=0
The angle of a straight road is approximately 12 degrees. Determine the percentage of this road.
- Trapezoid 2520
Trapezoid with sides a = 10, b = 20, c = 25, d = 15. Calculate all internal angles.
- Periodicity 81597
Simplify by using periodicity cos 1125°
- Instantaneous 69064
Describe how the instantaneous power value in the AC circuit changes during one period.