鉴于 #A + B = 90 ^ @# 然后 #A = 90-B ^ @#
#rarr(tanAtanB + tanAcotB)/(sinAsecB) - (罪^ 2B)/(COS ^ 2A)#
#=(TANA tanB + cotB)/(sinAsecB) - (罪^ 2B)/(COS ^ 2(90 ^ @ - B)#
#=((取消(新浪)/ COSA)SINB / +的CoSb的CoSb / SINB)/(取消(新浪)/的CoSb) - (罪^ 2B)/(SIN ^ 2B)#
#=((1 / COSA)(罪^ 2B + COS ^ 2B)/(SINB *取消(的CoSb)))/(1 /取消(的CoSb)) - 1#
#= 1 /(cos(90 ^ @ - B)SINB)-1#
#= 1 /罪^ 2B-1 =(1-罪^ 2B)/ SIN ^ 2B =(COS ^ 2B)/(SIN ^ 2B)= ^婴儿床2B#
鉴于 #A + B = 90 ^ @# 然后A = 90-B ^ @#
现在
#(tanAtanB + tanAcotB)/(sinAsecB) - (罪^ 2B)/(COS ^ 2A)#
#(TAN(90 ^ @ - B)tanB +黄褐色(90 ^ @ - B)cotB)/(SIN(90 ^ @ - B)SECB) - (罪^ 2B)/(COS ^ 2(90 ^ @ - B))#
#=(cotBtanB + cotBcotB)/(cosBsecB) - (罪^ 2B)/(SIN ^ 2B)#
#= 1 +婴儿床^ 2B-1 =婴儿床^ 2B#