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Question Number 190938 by Shrinava last updated on 14/Apr/23
Answered by Frix last updated on 15/Apr/23
tan3x−tanxtan11xtan13x=0Wecantransformthistosin28x−sin20x+sin4x=0y=4xsin7y−sin5y+siny=0s=siny&transformings(s6−3s42+9s216−364)=0s=0★t=s2t3−3t22+9t16−364=0u=t−12u3−3u16−164=0u=−cos2π92∨u=−sinπ182∨u=cosπ92★NowwehavetogobackFor0⩽x<π2Igetxπ∈{0,136,118,19,536,736,29,14,518,1136,1336,718,49,1736}
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