2被根号3(Sin(B+π/3)+SinB)+3变形为4倍根号3Sin(B+6/π)Cos(π/6)+3 要求过程与用到的公式,
人气:109 ℃ 时间:2024-11-23 19:41:00
解答
2 (根号3) [ sin (B +π/3) +sin B ]
=2 (根号3) *2 sin [ (B +π/3 +B) /2 ] cos [ (B +π/3 -B) /2 ]
=4 (根号3) *sin (B +π/6) cos (π/6) +3
=6 sin (B +π/6) +3.
= = = = = = = = =
和差化积:
sin A +sin B = 2 sin [ (A+B) /2 ] cos [ (A-B) /2 ].
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