Answer:
answer is 2773+₹+783838837473
[tex] \bf \pink{A + 28 - 30 = A - 2}[/tex]
And:
[tex] \bf \pink{(A - C)/2 = (A - C)/2}[/tex]
So, the original equation:
[tex] \bf \pink{cos(A+28-30) (A-C)/2}[/tex]
Becomes:
[tex] \bf \pink{cos((A-C)/2)}[/tex]
