Question

if Cosecø - Sinø = A³ , Secø-Cosø = b³ prove that a²b²(a²+b²)=1 ..... i need the answer copy and specially in the step how Cos4/3ø×Cos2/3ø+Sin4/3ø×Sin2/3ø... i need a step by step cancellation process don't copy it from google its an request
;-) ​

Answer 1

 sin  ^2 A +  cos ^2 A = 1 ..

is the formulae taken in the last step, in a^2+b^2

hope this'll be helpful