6sin（-90度）怎么算啊啊?
sin是y比上rsin(-90)的Y等于-1
r为1
所以sin(-90)=-1
所以6sin(-90)=-6
绛旓細鎵浠6sin(-90)=-6
绛旓細6sin(-90搴)=6X锛-1锛=-6 3sin0=3X锛0锛=0 8sin270=8X锛-1锛=-8 12cos180=12X锛-1锛=-12 鍘熷紡=-6+0-锛-8锛+锛-12锛=-10
绛旓細sin(-90搴︼級=-1 sin0搴=0 sin270搴=-1 cos180搴=-1 鎵浠6sin(-90搴︼級+3sin0搴-8sin270搴+2cos180搴 =6*(-1)+3*0-8*(-1)+2*(-1)=-6+0+8-2 =0
绛旓細鎵浠 sin锛-90掳锛=-sin90掳=-1 鍐嶄箻浠6灏辩瓑浜-6
绛旓細sin(-90搴︼級=-sin90搴=-1 sin0搴=0 sin270搴=-1 cos180搴=-1 鎵浠ュ師寮=-6+0+8-12=-10
绛旓細6sin(-90搴)+3sin0搴-8sin270搴+12cos180搴 =6*(-1)+3*0-8*(-1)+12*(-1)=-10 10cos270搴+4sin0搴+9tan0搴+15cos360搴 =10*0+4*0+9*0+15*1 =15 2cos蟺/2-tan蟺/4+3/4tan^2 蟺/6/-sin蟺/6+cos^2 蟺/6+sin3蟺/2 cos蟺/2=0 tan蟺/4=1 (tan蟺/6)^2...
绛旓細鍥炵瓟锛歽=arcsinx 鍜寉=sinx鏄弽鍑芥暟鐨勫叧绯 鍋囪鏈変竴涓洿瑙掍笁瑙掑舰ABC,鈭燙鏄90搴鐨勮瘽,閭ｄ箞鈭燗鐨勫害鏁版槸绠椾笉鍑烘潵鐨勫惂
绛旓細绛旓細sin(-90)=-1,cos(-90)=0
绛旓細cos90搴=0锛sin90搴=1銆傚湪鐩磋涓夎褰腑锛屽綋骞抽潰涓婄殑涓夌偣A銆丅銆丆鐨勮繛绾匡紝AB銆丄C銆丅C锛屾瀯鎴愪竴涓洿瑙掍笁瑙掑舰锛屽叾涓垹ACB涓虹洿瑙掋傚鈭燘AC鑰岃█锛屽杈癸紙opposite锛塧=BC銆佹枩杈癸紙hypotenuse锛塩=AB銆侀偦杈癸紙adjacent锛塨=AC銆傚湪骞抽潰鐩磋鍧愭爣绯粁Oy涓鈭犖茬殑濮嬭竟涓簒杞寸殑姝ｅ崐杞达紝璁剧偣P锛坸锛寉锛変负鈭犖茬殑...
绛旓細tan锛夛細tan(30掳) = 1 / 鈭3 鈮 0.577瀵逛簬60搴﹁锛- 姝ｅ鸡锛坰in锛夛細sin(60掳) = 鈭3 / 2 鈮 0.866- 浣欏鸡锛坈os锛夛細cos(60掳) = 0.5- 姝ｅ垏锛坱an锛夛細tan(60掳) = 鈭3瀵逛簬90搴瑙掞細- 姝ｅ鸡锛坰in锛夛細sin(90掳) = 1- 浣欏鸡锛坈os锛夛細cos(90掳) = 0- 姝ｅ垏锛坱an锛夛細tan(90掳...
