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Cos80°Cos35° Cos10°Cos55°

cos80cos35+cos10cos55=cos80cos35+sin80sin3

ٽһĻ͵úͻʽ 4520.20㻹

ԭʽ=cos80cos35+sin80sin35=cos(80-35)=cos45

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ǺתиΪ55ȵֱУһǾǣ90ȣ55ȣ35

sin10cos35+cos10cos55 =sin10cos35+cos10s

cos35*cos55 =cos35*sin35 =(sin70)/2

cos80cos35+sin80cos55 =cos80cos35+sin80sin

sin35cos55+cos35sin55 =sin35+55 =sin90 =1

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