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a)
2 sin 15 * cos 15 = sin(15*2) = sin 30 = 0,5
d)
2 sin pi/8 cos pi/8 = sin(pi/8 * 2) = sin(pi/4) =
g)
2sin165 cos 165 = sin(165*2)= sin 330 = sin(360-30)= sin(-30) = -sin 30 = -0,5
kosinusy:
tangensy: