Respuesta:
C= 1/2
Ultima alternativa
Explicación paso a paso:
Propiedas Reciproca:
Sen(a)Csc(a)= 1
Cos(a)Sec(a)= 1
Tan(a)Cot(a)= 1
2Cos(10°)Sec(10°)= 2(1)
5Tan(40°)Cot(40°)= 5(1)
2(1)+1/5(1)+1= 3/6= 1/2
