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α+β=90⁰
a)
tgα=1
α=β=45⁰
b)
tgα=9/16=0,5625 ⇒ α≈29⁰, β=61⁰
c)
tgα=1,4 ⇒ α≈42⁰ , β=48⁰
d)
tgα=4 ⇒ α≈76⁰, β=14⁰