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1 December, 15:42

Cos10°-sin10°:cos10°+sin10°=tan45°

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  1. 1 December, 16:07
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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
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