6cos30°×tan 30°-2sin²45 °

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6cos30°×tan 30°-2sin²45 °

=6 sin30° - 2 sin²45 °
=6×1/2-2×(√2/2)²
=3-2×1/2
=2

6cos30°×tan 30°-2sin²45 °
=6×√3/2×√3/3-2×(√2/2)²
=3-1
=2