Question

solve this. please. I know the answer is (c) 1 but I don't know how to get the answer ​

Answer 1

Sin^3( 90 - 20) - Cos^3 70 by Sin^3 70 - Cos^3 (90 - 20)

Sin70 - Cos^3 70 by Sin^3 70 - Cos^3 70

= > 1

I hope it will help u....✌✌