Sin^2 20+sin^2 70- tan^2 45

1.	Sin^2 20+sin^2 70- tan^2 45
Answer» Sin^2 20°+sin(90°-20°)-tan^2 45°Sin^2 20°+cos^2 20°-tan^2 45°Now ,. Sin2 A + cos2 A = 1 ( identity)And tan 45 °= 1 tan2 45°= 1^21 - 1 =0.

Discussion