3 sin²30+2tan²60-5cos²45+1/2
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3sin²30+2tan²60-5cos45²+1/2
=3×(1/2)²+2(√3)²-5×(1/√2)²+1/2
=3×1/4+2×3-5×1/2+1/2 (subracting 1/2)
=3×1/4+2×3-5
=3×1/4+1
=3/4+1
=3+4/4
=7/4
answer is 7/4 .
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