=sin60cos45-sin(-360-60)cos(150-720)
=sin60cos45+sin60cos150
=√3/2×√2/2+√3/2×(-√3/2)
=(√6-3)/4
sin60°cos(-45)-sin(-420)cos(-570)
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相关问题
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求值[tan(-330)cos(-570)cos150sin(-420)]/[cos(-420)sin(-690)]
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