sin(x+30)*cos(x+45)

3个回答

sin(x+30度)*cos(x+45度)*csc(45度-x)*tg(60度+x)*tg(30度-x)*sec(60度-x)
=sin(x+30度)*cos(x+45度)*[1/sin(45度-x)]*[tg(60度+x)*ctg(60度+x)]*[1/cos(60度-x)]
=sin(x+30度)*cos(x+45度)*[1/cos(45度+x)]*1*[1/sin(30度+x)]
=1