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請問(b)(ii)點做?


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2017-7-3 10:02 PM

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consider the formula of (a), cos(x)^2 = [1+cos(2x)]/2,
Because cos(x) >= 0 for 0<=x<=pi/2,
we have cos(x/2) = sqrt((1+cos(x))/2) for    0<=x<=pi

Use the above formula for the case of n+1 in induction

[ 本帖最後由 ppresent 於 2017-7-3 11:43 PM 編輯 ]



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