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Cos10°-sin10°÷cos10°+sin10°=tan45°
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Cos10°-sin10°÷cos10°+sin10°=tan45°

User Bibscy
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1 Answer

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cos10-sin10÷cos10+sin10
=sin(90-10)-sin10÷sin(90-10)+sin10
=sin80-sin10÷sin80+sin10
=sin(80-10)÷sin(80-10)
=sin70÷sin70
=1
tan45=1
hence proved
User Reid Johnson
by
6.2k points
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