Maths Formulas Sometimes, Math is Fun and sometimes it could be a surprising fact too In our routine life, you can check the best route to your school, you can check where more discounted products are available in the market, and you can check which bank can offer the superior interests This is all aboutDoubleAngles Identities (Continued) • take the Pythagorean equation in this form, sin2 x = 1 – cos2 x and substitute into the First doubleangle identity cos 2x = cos2 x – sin2 x cos 2x = cos2 x – (1 – cos2 x) cos 2x = cos True Start with the well known pythagorean identity sin^2x cos^2x = 1 This is readily derived directly from the definition of the basic trigonometric functions sin and cos and Pythagoras's Theorem Divide both side by cos^2x and we get sin^2x/cos^2x cos^2x/cos^2x = 1/cos^2x tan^2x 1 = sec^2x tan^2x = sec^2x 1 Confirming that the result is an identity
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