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Pirmykštė funkcija ir neapibrėžtinis integralas

Pirmykštė funkcija ir neapibrėžtinis integralas

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3. Jei pointegralinė <strong>funkcija</strong> R sin x , cos x yra lyginė sin x<strong>ir</strong> cos(x) atžvilgiu t.y.R −sin x , − cos x = R sin x , cos x ,tai naudojamas keitinys tg(x)=t.sin x =cos x =x = arctg tdx =dt1 + t 2tg(x)1 + tg 2 (x) =11 + tg 2 (x) =t1 + t 211 + t 2

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