Use trigonometric identities to transform the left side of the equation into the right side (0 < θ < π/2).
sin2 θ − cos2 θ = sin2 θ −
= 2 sin2 θ − 1

Which triangles could not be similar to triangle abc ? triangle a b c where angle b is a right angle. side a b is 15 cm. side b c is 8 cm. side a c is 17 cm. select each correct answer. right triangle g h i with right angle at h. g h is 77 centimeters. g i is 85 centimeters. h i is 36 centimeters. right triangle j k l with right angle at k. j k is 60 centimeters. j l is 68 centimeters. k l is 32 centimeters. right triangle m n o with right angle at n. m n is 35 centimeters. m o is 37 centimeters. n o is 12 centimeters. right triangle d e f with right angle at e. d e is 22.5 centimeters. d f is 25.5 centimeters. e f is 12 centimeters.