mi ges be yu tri tu sae
[tan(x) /sekant(x-1)]^2=2* kosekant(x)...2*csc(x)...=2/sine(x)
sekant=1/kosine, so 1/sekant=kosine
tan=sine/kosine, so tan*kosine=(sine/kosine)*kosine=sine
but yu hav tan(x)*kosine(x-1), so kant kansel stuf
Thats as far as me get...dont no wot tu du next