Find the exact value for cos(75)

square route of 6-square route of 2/4

square route of 6+2/4

square route of 2+ square route of 6/4

square route of 2-square route of 6/4

cos(75) = cos(45 + 30) = cos(45)cos(30) - sin(45)sin(30) = (1/√2)(√3/2) - (1/√2)(1/2) = 2/4(√6 - √2)

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