tan2tcsc2ztant blankblank csczSolutiontan2tcsc2ztant blankbl

tan^2t-csc^2z=(tant- blank)(blank +cscz)

the left hand part is of the form a^2 -b^2

where a=tant and b= cscz

but a^2 -b^2 =(a-b)(a+b)

so tan^2t -csc^2z = (tant -cscz) (tant + cscz)

so in the 1st blank we fill it with cscz

in the 2nd blank we will fill it with tant