# Cosine + real numbers - problems

- Trigonometric functions

In right triangle is: ? Determine the value of s and c: ? ? - Regular 5-gon

Calculate area of the regular pentagon with side 7 cm. - Forces

In point O acts three orthogonal forces: F_{1}= 20 N, F_{2}= 7 N and F_{3}= 19 N. Determine the resultant of F and the angles between F and forces F_{1}, F_{2}and F_{3}. - IS triangle

Calculate interior angles of the isosceles triangle with base 38 cm and legs 26 cm long. - Cuboid

Determine the dimensions of cuboid a, b, c; if diagonal d=9 dm has angle with edge a α=55° and has angle with edge b β=58° - Triangle TBC

TBC is isosceles triangle with base TB with base angle 63° and legs length |TC| = |BC| = 25. How long is the base TB? - Cotangent

If the angle α is acute, and cotg α = 1/3. Determine the value of sin α, cos α, tg α.

We apologize, but in this category are not a lot of examples.

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Do you have an interesting mathematical problem that you can't solve it? Enter it, and we can try to solve it.