Question

Considerando 0 < a < 90° calcule sen a , cos a e sec a, sendo tan a = 5/4

Answer 1

Tan a = 5/4

5² + 4² = hip²
25+16 = hip²
√41 = hip

sen a = 5/√41 * √41/ √41 = 5√41 /41

cos a = 4/ √41 * √41/ √41 = 4√41 / 41

sec a = √41 /4