Question

what is 3 sin^2 20 - 2 tan^2 45 + 3 sin ^2 70

Answer 1

3sin²20-2tan²45+3sin²70
= 3(sin²20+cos²(90-70)) -2(1)
=3(1)-2
=1

Answer 2

3sin^2 20 +3cos^2 20 -2 (1)
3 (1)-2 (1)
1