Calcule o valor de cada expressão.
a) sen 0º . sen 135º+sen 30º. sen 30º
b) sen π/3 . sen 3π/2 - sen 4π/3 . sen 2π/3
c)√3 (sen 120º - sen 240º)/sen 330º - sen 180º
d) √2 . sen π/4 - sen 5π/6 / senπ + sen π/6
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