Question

sin35°×tan45°×cos10°+sin55°×sin10°等于多少

Answer 1

原式=sin35°×cos10°+sin55°×sin10°
=sin35°*cos10°+sin10°*cos(90°-55°)
=sin35°*cos10°+sin10°cos35°
=sin(35°+10°)
=sin45°
=√2/2

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Answer 2

sin35°tan45°cos10°＋sin55°sin10°
=sin35°cos10°＋cos35°sin10°
=sin(35°＋10°)
=sin45°
=√2/2 【2分之根号2】

Answer 3

原式=sin35 x 1 x cos10 + sin55 x sin10
=sin35 x cos10 + sin55 x sin10
=1/2 x (sin45 + sin25) + 1/2 x (cos45 - cos65)
(sin25 = cos65)
=√2/2。

Answer 4

sin35°×tan45°×cos10°+sin55°×sin10°
=sin35°×cos10°+cos35°×sin10°
=sin(35+10)°
=sin45°
=√2/2

Answer 5

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