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cos 135° = - 1/2√2
p ⇒ ~ q ≡ q ⇒ ~p ≡ ~p ∨ ~q
tabel nilai kebenaran p ⇒ ~ (p ∨ q)
p q (p ∨ q) ~(p ∨ q) p ⇒ ~ (p ∨ q)
B B B S S
B S B S S
S B B S B
S S S B B
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