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Timber
Mathematics
1 December, 15:42
Cos10°-sin10°:cos10°+sin10°=tan45°
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Nickolas
1 December, 16:07
0
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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