设a∈(3π/2,2π),化简:根号1/2+1/2*根号1/2+1/2cos2a
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设a∈(3π/2,2π),化简:根号1/2+1/2*根号1/2+1/2cos2a
设a∈(3π/2,2π),化简:根号1/2+1/2*根号1/2+1/2cos2a
设a∈(3π/2,2π),化简:根号1/2+1/2*根号1/2+1/2cos2a