вычислить: lim(x->0) sinx*cosx/x

вставте одно из слово сочетаний

People from the(1)_________(east/north)to the(2)_______(north/west) of the USA happily celebrate local and national(3)________(parades/occasions).Some of them, like Thaksgiving Day, are(4)____________(connected/told) with American history, others,like Christmas are(5)___________(associated/included) with(6)___________(historical/religious) events.Independence Day that(7)___________(is associated/marks) the birth of the country is(8)________(widely/often) celebrated by the Americans. Wherever Americans are on the day they always(9)___________(decide/unite) for picnics, barbecues and to watch(10)___________(fireworks/films). Many Americans gladly(11)_________(remember/follow) their local or ethnic traditions and take part in local festivals and fairs. These celebrations(12)____________(include/unite) special food, drink and entertainment.(13)____________(As/Although) the history of the USA is not long, the country has a long list of national, ethnic and regional celebrations.

Во сколько раз изменится напряжённость электрического поля уединённого плоского конденсатора, если заряд одной из пластин увеличить вдвое ?