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value for cos(5pi/12)

asked Aug 8, 2017 in Algebra by Brenden

1 Answer

5π/12 = 2π/12 + 3π/12 = π/6 + π/4

 cos(π/6 + π/4) = cos(π/6) * cos(π/4) - sin(π/6) * sin(π/4)

= (√3/2)(√2/2) - (1/2)(√2/2)

= √6/4 - √2/4

Have a nice day!
answered Aug 9, 2017 by quickwriter (2,510 points)
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