Pp. 84-125 (42)
This section is for the essential algebraic connections related to the
trigonometric functions introduced in the precedent chapters and for the
immediate implications and applications in the Euclidean geometry.
Trigonometric formulae, calculus by identities, inequalities,
equations, inequations and their specified solutions, complex numbers’
plane projection and geometrical examples.
Romanian Academy of Scientists, “Vasile Alecsandri” University of Bacău, România.