Could someone explain how it is done.












0












$begingroup$


enter image description here



enter image description here



I know that you may start by saying that the given integral is going to be equal to $frac{2n-1}{2n} cdot int_0^{frac{pi}{2}}cos^{2n-2}(theta) dtheta$. but after that I do not know what to do.










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$endgroup$








  • 2




    $begingroup$
    See reduction formulae. Integration by parts facilitates the derivation of the formula you need here.
    $endgroup$
    – Mark Viola
    Jan 17 at 21:05








  • 1




    $begingroup$
    Also, these are Wallis's integrals
    $endgroup$
    – Picaud Vincent
    Jan 17 at 21:11










  • $begingroup$
    Possible duplicate of Prove that problem ASAP
    $endgroup$
    – John Douma
    Jan 17 at 21:26
















0












$begingroup$


enter image description here



enter image description here



I know that you may start by saying that the given integral is going to be equal to $frac{2n-1}{2n} cdot int_0^{frac{pi}{2}}cos^{2n-2}(theta) dtheta$. but after that I do not know what to do.










share|cite|improve this question











$endgroup$








  • 2




    $begingroup$
    See reduction formulae. Integration by parts facilitates the derivation of the formula you need here.
    $endgroup$
    – Mark Viola
    Jan 17 at 21:05








  • 1




    $begingroup$
    Also, these are Wallis's integrals
    $endgroup$
    – Picaud Vincent
    Jan 17 at 21:11










  • $begingroup$
    Possible duplicate of Prove that problem ASAP
    $endgroup$
    – John Douma
    Jan 17 at 21:26














0












0








0





$begingroup$


enter image description here



enter image description here



I know that you may start by saying that the given integral is going to be equal to $frac{2n-1}{2n} cdot int_0^{frac{pi}{2}}cos^{2n-2}(theta) dtheta$. but after that I do not know what to do.










share|cite|improve this question











$endgroup$




enter image description here



enter image description here



I know that you may start by saying that the given integral is going to be equal to $frac{2n-1}{2n} cdot int_0^{frac{pi}{2}}cos^{2n-2}(theta) dtheta$. but after that I do not know what to do.







calculus






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Jan 17 at 21:59









user289143

1,000313




1,000313










asked Jan 17 at 21:00









Konstantin UvarovKonstantin Uvarov

41




41








  • 2




    $begingroup$
    See reduction formulae. Integration by parts facilitates the derivation of the formula you need here.
    $endgroup$
    – Mark Viola
    Jan 17 at 21:05








  • 1




    $begingroup$
    Also, these are Wallis's integrals
    $endgroup$
    – Picaud Vincent
    Jan 17 at 21:11










  • $begingroup$
    Possible duplicate of Prove that problem ASAP
    $endgroup$
    – John Douma
    Jan 17 at 21:26














  • 2




    $begingroup$
    See reduction formulae. Integration by parts facilitates the derivation of the formula you need here.
    $endgroup$
    – Mark Viola
    Jan 17 at 21:05








  • 1




    $begingroup$
    Also, these are Wallis's integrals
    $endgroup$
    – Picaud Vincent
    Jan 17 at 21:11










  • $begingroup$
    Possible duplicate of Prove that problem ASAP
    $endgroup$
    – John Douma
    Jan 17 at 21:26








2




2




$begingroup$
See reduction formulae. Integration by parts facilitates the derivation of the formula you need here.
$endgroup$
– Mark Viola
Jan 17 at 21:05






$begingroup$
See reduction formulae. Integration by parts facilitates the derivation of the formula you need here.
$endgroup$
– Mark Viola
Jan 17 at 21:05






1




1




$begingroup$
Also, these are Wallis's integrals
$endgroup$
– Picaud Vincent
Jan 17 at 21:11




$begingroup$
Also, these are Wallis's integrals
$endgroup$
– Picaud Vincent
Jan 17 at 21:11












$begingroup$
Possible duplicate of Prove that problem ASAP
$endgroup$
– John Douma
Jan 17 at 21:26




$begingroup$
Possible duplicate of Prove that problem ASAP
$endgroup$
– John Douma
Jan 17 at 21:26










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