根号下[sin^2(500°)+sin^2(770°)-cos^2(1620°-x)],(180°
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根号下[sin^2(500°)+sin^2(770°)-cos^2(1620°-x)],(180°
根号下[sin^2(500°)+sin^2(770°)-cos^2(1620°-x)],(180°
根号下[sin^2(500°)+sin^2(770°)-cos^2(1620°-x)],(180°
(180°
500=360+140
140=180-40
770=720+50
1620=1800-180
(sin500)^2+(sin770)^2-(cos(1620-x))^2
=(sin40)^2+(sin50)^2-(cosx)^2
=1-(cosx)^2
=(sinx)^2
√(sinx)^2=|sinx|=-sinx