let f(x)=e^(−nx) ln(2+x^2 ) with n integr natural
1) calculste f^((n)) (x) and f^((n)) (0)
2) developp f at integr serie
3)find ∫_0 ^1 f(x)d and ∫_0 ^∞ f(x)dx
((sin(x))/(√(2sin^2 (x)+cos^2 (x)))) +(1/(√2))=csc(x)(√(2sin^2 (x)+cos^2 (x)))
show that
x={(π/2)+2πn} and x={cos^(−1) ((√3))−π+2πn}
and x={−cos^(−1) ((√3))+2πn}