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prove sin^4 theta - cos^4 theta = 2sin ^2 theta - 1 Answer: sin^4 theta - cos^4 theta = (sin^2 theta + cos^2 theta)x (sin^2 theta - cos^2 theta) (difference of two squares) = (1)(sin^2 theta - cos^2...

Try the questions from Get Smart: Physics Calculations book. Apart from doing the projectile questions from past HSC papers I suggest doing projectile questions in past papers from other schools as well, but you have to go through each paper and look for these questions. It's really good to...

"hameoglobin substitute" means artificial chemicals other than haemoglobin that also has the ability to carry oxygen. They are used for patients with low haemoglobin (Hb) counts in the blood. There are two types of Hb substitutes: modified Hb and perflourochemicals Modified Hb- are...