What is the value of $\\cos ( - \\pi )$?
![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
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SOLVED:Trigonometric identities Find the exact value of cos(π/ 12)
cos(pi/4-A)cos(pi/4-B)-sin(pi/4-A)sin(pi/4-B)=sin(A+B)
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