Question

Find the value of: 3sin^2 20º - 2tan^24 5º +3sin^2 70º

Answer 1

solution

3sin²20° -2tan²45 +3sin²70

3(0.342)² - 2(1) ² + 3(0.94)²

3(0.116) - 2(1) + 3(0.8836)

1.24 - 2 + 2.65

=189/100