'tan (pi/4+x)/tan(pi/4-x) = [(1 + tanx)(1- tanx)] ^2' || tan(π/4+x)/tan(π/4-x)=(1+tanx/1-tanx)^2
cos(3pi/4+x)-cos(3pi/4-x)=-sqrt(2)sinx || Prove that `cos(3pi/4+x)-cos(3pi/4-x)=-sqrt(2)sinx`
曲線間の面積: y = cos(pi*x)、y = 4x^2 -1
なぜパイがここにいるのですか?そしてなぜ四角いのでしょうか?バーゼル問題に対する幾何学的な答え
cos(pi/4+x)+cos(pi/4-x)=root2.cosx || example15 chapter3 11th math
#Trigonometry all formulas
Prove that `cos(pi/4+x)+cos(pi/4-x)=sqrt(2)cosx` ....
lim〗┬(x→0)〖〖sin〗^2(π 〖cos〗^4x )/x^4 〗 is equal to:
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フーリエ級数: 1/n^4 の合計 = pi^4/90、1/(2n-1)^2 の合計 = pi^2/8
数学者が退屈するとき (ep1)