meshearer
meshearer
23-03-2017
Mathematics
contestada
simplify [2 (cos 210 + i sin 210)]^2
Respuesta :
ChandrikaP
ChandrikaP
23-03-2017
2{(cos^210+isin^210)}^2
2(cos^210-sin^10+2i*cos10*sin10)
2(cos20+i*sin20)
cos^2Ф-sin^2Ф=cos2Ф and 2sinФcosФ=sin2Ф here Ф=10°
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