sint乘cost

汲瑾茅2916tant/2是怎么转化为sint/1+cost的 要过程 -
瞿龙寿19212921102 ______ 解答过程如下: sint/(1+cost) =2sin(t/2)cos(t/2)/(1+2(cos(t/2))^2-1) =sin(t/2)/cos(t/2) =tan(t/2) 半角公式:tan(t/2)=sint/(1+cost) 半角公式是利用某个角(如∠A)的正弦值、余弦值、正切值,及其他三角函数值,来求其半角的正弦值,余弦值,正切...

汲瑾茅29161/(cost+sint)的积分怎么算?
瞿龙寿19212921102 ______ 设x=tan(t/2),则sint=2sin(t/2)cos(t/2)=2tan(t/2)/sec²(t/2)sint=2x/(1+x²)cost=2cos²(t/2)-1=2/sec²(t/2)-1cost=(1-x²)/(1+x²)t=2arctanxdt=2dx/(1+x²)原式=∫2dx/(1-x²+2x)已经有理化了.

汲瑾茅2916周期信号sint+cos3t的周期T是什么 -
瞿龙寿19212921102 ______ sint周期为2π,cos3t周期为2π/3,总的周期T=m1*2π=m2*2π/3,则3m1=m2,取m1=1,则周期为T=2π

汲瑾茅2916x=sint+cost y=sintcost 化为普通方程. -
瞿龙寿19212921102 ______[答案] ∵(sint+cost)²=sin²t+2sintcost+cos²t=1+2sintcost ∴x²=1+2y ∴y=x²/2-1/2

汲瑾茅2916cost除以sint等于多少 -
瞿龙寿19212921102 ______ cos t÷sin t=cot t ~回答完毕~ ~\(^o^)/~祝学习进步~~~

汲瑾茅29161/(cost+sint) 最小值 -
瞿龙寿19212921102 ______ 求解: t = 225度时,取得最小值, 1/(-√2/2-√2/2) =-1/√2 =-√2/2

汲瑾茅2916sint/(1 - cost)求导 -
瞿龙寿19212921102 ______ f'(t)=[(sint)'(1-cost)-(sint)(1-cost)']/(1-cost)

汲瑾茅2916cost的平方/sint 的不定积分
瞿龙寿19212921102 ______ cost^2/sintdt =(1-sint^2)/sintdt =1/sintdx-sintdt =csctdt-sintdt =lnlcsct-cottl+cost+c

汲瑾茅2916用万能公式解cost/(sint+cost)的不定积分 -
瞿龙寿19212921102 ______[答案] 干嘛非用万能公式不可 cost=1/2[(sint+cost)+(cost-sint)] ∫cost/(sint+cost)dt =1/2∫[1+(cost-sint)/(sint+cost)]dt =1/2[t+ln|sint+cost|]+C

汲瑾茅2916(cost+sint)/(cost - sint) 化简 -
瞿龙寿19212921102 ______[答案] (sint + cost) / (cost-sint) = [(sint + cost)/√2] / [(cost - sint)/√2] = (sint cosπ/4 + cost sinπ/4) / (cost cosπ/4 - sint sinπ/4) = sin(t+π/4) / cos(t+π/4) = tan(t+π/4)