急求sin30度除以sin10度减去cos30度除以cos10度,求值

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急求sin30度除以sin10度减去cos30度除以cos10度,求值
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急求sin30度除以sin10度减去cos30度除以cos10度,求值
急求sin30度除以sin10度减去cos30度除以cos10度,求值

急求sin30度除以sin10度减去cos30度除以cos10度,求值
sin30/sin10-cos30/cos10
=(sin30cos10-cos30sin10)/sin10cos10
=2sin(30-10)/(2sin10cos10)
=2sin20/sin20
=2

sin30°/sin10°-cos30°/cos10°
=(sin30°cos10°-sin10°cos30°)/sin10°cos10°
=2sin(30°-10°)/2sin10°cos10°
=2sin20°/sin20°
=2