Срочно решите 3 и 4 пример

Question

Срочно решите 3 и 4 пример

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Answer 1

1)v(t)=x`(t)
x`(t)=t^2+4t
v(4)=4^2+4*2=16+8=24 c/м
2)∫pi/4,-pi/4(1/cosx^2+sinx)dx=∫pi/4,-pi/4(1/cosx^2)dx+∫pi/4,-pi/4(sinx)dx=|pi/4,-pi/4(tgx-cosx)=tg(pi/4)-cos(pi/4)-(-tg(pi/4)-cos(pi/4)=1-√2/2+1+√2/2=2