Question

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Answer 1

Răspuns:

$\frac{ \sin(135) }{ \cos(45 ) } \\ \frac{ \sin(90 + 45) }{ \cos(45 ) } \\ \frac{ \cos(45) }{ \cos(45) } = 1$

la sin(90+45) am folosit formula: sin(90+t)=cos(t)

Answer 2

Răspuns:

Sin(cos 90°+45°) /cos (45°)

Folosim formula sin(90°+t)=cos(t),tranformam

cos(45°) /cos (45°) si impartirea dintre cele doua ne da rezultatul de 1