Tano + sino=m tano -sino=n
1/16(m4 +m2n2 +n4)=mn
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There I took it from an other answer, i hope it helps you the Id that wrote this answer and explanation is @krisha1652 full credits to them I am just helping you get the answer and be sure to check their profile for the answer that i've given here in screenshot. Thank you for the explanation :) oh and the question who asked is @pratham65488
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