sinnπx是几
由y=sint的图像可知，在t是π的整数倍的时候y都为0，故sinnπx为0绛旓細鐢眣=sint鐨勫浘鍍忓彲鐭ワ紝鍦╰鏄鐨勬暣鏁板嶇殑鏃跺檡閮戒负0锛屾晠sinn蟺x涓0
绛旓細璁＄畻鍏紡濡備笅锛蟺=sin(180掳梅n锛壝梟鍏紡婧愪簬鍦嗗舰鈥斺旀鏃犵┓杈瑰舰锛屽綋姝ゅ叕寮弉=鈭炴椂蟺鐨勫艰宸巼涓0锛屜=sin锛180掳梅1脳10¹⁴锛壝10¹⁴=3.1415926535898銆1銆侀┈闈掑叕寮 蟺=16arctan1/5-4arctan1/239 杩欎釜鍏紡鐢辫嫳鍥藉ぉ鏂囧鏁欐巿绾︾堪路椹潚浜1706骞村彂鐜般2銆佹媺椹姫閲戝叕...
绛旓細sin(n蟺+x)=鏍瑰彿2(sinx+cosx)nsin锛埾/n)=n[sin(蟺/n)]/(蟺/n)*(蟺/n)浠=蟺/n n[sin(蟺/n)]/(蟺/n)*(蟺/n)=n(sint)/t*(蟺/n)=n(蟺/n)=蟺 鍜岃鍏紡锛歴in ( 伪 卤 尾 ) = sin伪 路 cos尾 卤 cos伪 路 sin尾 sin ( 伪 + 尾 + 纬 ) = sin伪 路 cos...
绛旓細sin(n蟺+x)绛変簬鏍瑰彿2*(sinx+cosx)銆傛寮︼紙sine锛夋槸鏁板鏈锛屽湪鐩磋涓夎褰腑锛屼换鎰忎竴閿愯鈭燗鐨勫杈逛笌鏂滆竟鐨勬瘮鍙仛鈭燗鐨勬寮︼紝璁颁綔sinA锛堢敱鑻辫sine涓璇嶇畝鍐欏緱鏉ワ級锛屽嵆sinA=鈭燗鐨勫杈/鏂滆竟銆備笁瑙掑嚱鏁版槸鏁板涓睘浜庡垵绛夊嚱鏁颁腑鐨勮秴瓒婂嚱鏁扮殑涓绫诲嚱鏁般傚畠浠殑鏈川鏄换鎰忚鐨勯泦鍚堜笌涓涓瘮鍊肩殑闆嗗悎鐨勫彉閲忎箣...
绛旓細sinn蟺鐨勬瀬闄愭槸鏄細0銆倅=sin(n蟺)=0鎭掓垚绔嬶紝鎵浠->+鈭,y=sin(n蟺)鐨勬瀬闄愪负0銆傛暟瀛︿腑鐨勨滄瀬闄愨濇寚锛氭煇涓涓嚱鏁颁腑鐨勬煇涓涓彉閲忥紝姝ゅ彉閲忓湪鍙樺ぇ锛堟垨鑰呭彉灏忥級鐨勬案杩滃彉鍖栫殑杩囩▼涓紝閫愭笎鍚戞煇涓涓‘瀹氱殑鏁板糀涓嶆柇鍦伴艰繎鑰屸滄案杩滀笉鑳藉閲嶅悎鍒癆鈥濈殑杩囩▼涓傛鍙橀噺鐨勫彉鍖栵紝琚汉涓鸿瀹氫负鈥滄案杩滈潬杩...
绛旓細姝ｄ綑寮﹀嚱鏁扮殑n娆℃柟鐨勫懆鏈熷垎鍒负锛歯涓哄伓鏁版椂蟺锛宯涓哄熀鏁版椂2蟺銆傛寮﹀嚱鏁版槸涓夎鍑芥暟鐨勪竴绉嶃傚浜庝换鎰忎竴涓疄鏁皒閮藉搴旂潃鍞竴鐨勮锛堝姬搴﹀埗涓瓑浜庤繖涓疄鏁帮級锛岃岃繖涓鍙堝搴旂潃鍞竴纭畾鐨勬寮﹀sinx锛岃繖鏍凤紝瀵逛簬浠绘剰涓涓疄鏁皒閮芥湁鍞竴纭畾鐨勫約inx涓庡畠瀵瑰簲锛屾寜鐓ц繖涓搴旀硶鍒欐墍寤虹珛鐨勫嚱鏁帮紝琛ㄧず涓簓=sinx锛...
绛旓細1鍒100蟺鐨勫硷細1蟺=3.14锛2蟺=6.28锛3蟺=9.42锛4蟺=12.56锛5蟺=15.7锛6蟺=18.84锛7蟺=21.98锛8蟺=25.12锛9蟺=28.26锛10蟺=31.4 11蟺=35.45锛12蟺=37.68锛13蟺=40.83锛14蟺=43.96锛15蟺=47.1锛16蟺=50.24锛17蟺=53.38锛18蟺=56.52锛19蟺=59.66锛20蟺=62.8...
绛旓細鏄 sin(x) 鐨 n 娆℃柟锛屽綋 n 涓哄鏁版椂锛宻in^n(x) 鐨勫浘鍍忓拰 sin(x) 鐨勫浘鍍忓湪涓涓懆鏈熷唴淇濇寔涓鑷达紱鑰屽綋 n 涓哄伓鏁版椂锛宻in^n(x) 鐨勫浘鍍忓湪涓涓懆鏈熷唴浼氶噸澶嶄袱娆★紝鍥犳鍛ㄦ湡缂╃煭涓 蟺銆傛荤粨锛- 褰 n 涓哄鏁版椂锛宻in^n(x) 鐨勫懆鏈熶负 2蟺銆- 褰 n 涓哄伓鏁版椂锛宻in^n(x) 鐨勫懆鏈熶负 蟺銆
绛旓細鍥炵瓟锛氶儹鏁﹂鍥炵瓟: 鈭碘埆sin^nxdx=-(1/n)sin^(n-1)x cos x+[(n-1)/ n] 鈭玸in^(n-2)xdx 鈭玸in²dx=x/2-(1/4)sin2x+C sinx涓巆osx閮芥槸鍛ㄦ湡鍑芥暟,鑰屼笖鍦ㄥ尯闂碵0,蟺]鍐呭绉,涓婄Н鍒嗗嚱鏁拌涓篺(x) 鈭0鈫蟺sin^nxdx=f(x)|0鈫捪, f(x)|0鈫捪= f(x)|0鈫捪/2+ f(...
绛旓細鍥Sin(2蟺x)sin(n蟺x)=-1/2*[cos(n+2)蟺x-cos(n-2)蟺x]鈭玈in(2蟺x)sin(n蟺x)dx=-1/2鈭玔cos(n+2)蟺x-cos(n-2)蟺x]dx=-1/2{sin(n+2)x/[(n+2)*蟺]-sin(n-2)x/[(n-2)*蟺]}+C=sin(n-2)x/2蟺(n-2)-sin(n+2)x/2蟺(n+2)+C ...
