Reduzir:
C = sin50° - 2sin10°cos40°
a) tan40°
b) tan10°
c) cot10°
d) cot45°
e) sin30°
C = sin50° - 2sin10°cos40°
a) tan40°
b) tan10°
c) cot10°
d) cot45°
e) sin30°
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Resposta:
sin(40 + 10) = sin40cos10 + sin10cos40
C = sin40cos10 + sin10cos40 - 2sin10cos40
C = sin40cos10 - sin10cos40
C = sin(40-10)
C = sin30, letra E