- ardim
-
=sin(30十45)
=sin30cos45十sin45cos30
=1/2X根号2/2十根号2x根号3/2
=(根号2十根号6)/4
- 豆豆staR
-
sin(30+45)
- CarieVinne
-
sin75°
=sin(45°+30°)
=sin45°cos30°+cos45°sin30°
=(√6+√2)/4
.
很高兴为你解答,
=sin(30十45)
=sin30cos45十sin45cos30
=1/2X根号2/2十根号2x根号3/2
=(根号2十根号6)/4
sin(30+45)
sin75°
=sin(45°+30°)
=sin45°cos30°+cos45°sin30°
=(√6+√2)/4
.
很高兴为你解答,