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Calculated Cos (pi/2) with my graphing calculator, it says -5.10338076868E^-12 instead of 0, why? - Quora
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SOLVED: Use a half-angle formula to find the exact value of the given trigonometric function. Do not use a calculator. cos(pi/12)
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![Trigonometry] Why does (cos)pi/3 = 1/2 : r/learnmath](https://external-preview.redd.it/poDzsbdCjwBZ6964U2vs1m43FTDxfxBijzvXTWkmFbY.jpg?auto=webp&s=183f192a3e23f7871755737b920a0b5f7e2d804c "Trigonometry] Why does (cos)pi/3 = 1/2 : r/learnmath")
Trigonometry] Why does (cos)pi/3 = 1/2 : r/learnmath
Calculated Cos (pi/2) with my graphing calculator, it says -5.10338076868E^-12 instead of 0, why? - Quora
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How can we get the trig table value without a calculator? Is there any trick that exists? - Quora
Question Video: Using the Half Angle Formulas to Find the Exact Value of a Trigonometric Expression | Nagwa
