Determine o valor de:
a) Sen 40° * Cos 20° + Sen 20° * Cos 40°
b) Cos 50° * Cos 10° - Sen 50° * Sen 10°
c) Sen 160° * Cos 70° - Sen 70° * Cos 160°
d) Cos 75° * Cos 15° + Sen 75° * Sen 15°
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