(cosx/12+sinx/12)(cosx/12-sinx/12)=?
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(cosx/12+sinx/12)(cosx/12-sinx/12)=?(cosx/12+sinx/12)(cosx/12-sinx/12)=?(cosx/12+sinx/12)(cosx/12-si
(cosx/12+sinx/12)(cosx/12-sinx/12)=?
(cosx/12+sinx/12)(cosx/12-sinx/12)=?
(cosx/12+sinx/12)(cosx/12-sinx/12)=?
x是π吧
原式=cos²π/12-sin²π/12
=cos2*π/12
=cosπ/6
=√3/2
(cosx/12+sinx/12)(cosx/12-sinx/12)
=(cosx/12)(cosx/12)-(sinx/12)(sinx/12)
=cosx/6
cos2X/144吧
(cosx/12+sinx/12)(cosx/12-sinx/12)=?
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