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Cos(匯悖/2)吉噐謹富

眉叔痕方巷塀。

sin2x=cos(2x-pi/2)=2*(3/5)^2-1=7/25

圻籾哘頁:譜tana=3,夸(sin(a-π)+cos(π-a))/(sin(π/2-a)+cos(π/2+a)) (sin(a-π)+cos(π-a))/(sin(π/2-a)+cos(π/2+a)) =((-sina)+(-cosa))/(cosa-sina) =-(cosa+sina)/(cosa-sina) =-(1+tana)/(1-tana) =-(1+3)/(1-3) =2 錬李嬬逸欺低

蟒眸臧塰麻舜夕侭幣。 泌惚盾畳阻諒籾散哭低泣似 ^寡追 ̄。 泌惚挽嗤音苧散哭写偬弖諒。 厘匯違嬬壓耽爺賠蛙鎗泣恣嘔貧濬盍陝

盾基 tan(悖匯a)〜cos³(匯a匯悖)tan(匯a匯2悖) =(-tana)*(-cosa)³*(-tana) =-tan²a*cos³a =-sin²a/cos²a *cos³a =-sin²a*cosa

傍苧佐北瞋Ω段韮 厮岑0

sin(π-a)=sina cos(2π-a)=cosa tan(-a-π)= - tan(π+a)= - tana f(a)=sina*cosa*(-sina)/(cosa)= - (sina)^2

1. Cos2x=cos(x+x) = cosxcosx-sinxsinx =(cosx)峠圭 - (sinx)峠圭 =(cosx + sinx)(cosx-sinx) 2.Tan(π/4+x) = (1+tanx)(1-tanx) = (1+sinx/cosx)(1-sinx/cosx) =((cosx+sinx)/cosx)((cosx-sinx)cosx) =(cosx+sinx)(cosx-sinx)/cosx 侭參1/2 =...

T=6πymax=1ymin=-1

喇cosa+π/6=5/13 a(0π/2 侭參a+π/6(└/6,2π/3 sina+π/6=12/13 cosa=a+π/6-π/6 =cosa+π/6cosπ/6+sina+π/6sinπ/6 =〔3/2〜5/13+1/2〜12/13 =5〔3+12/26

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