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Use the cofunction identities to write an expression that is equivalent to each of the following expression.

a) sin(pi/6)

sin=cos(pi/2 - pi/6)

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  1. what is π/2 - π/6 ??
    = 3π/6 - π/6 = 2π/6 = π/3

    so sin(π/6) = cos(π/3)

    check:
    sin(π/6) = sin 30° = 1/2
    cos(π/3) = cos 60° = 1/2
    All is good!

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