观察下列等式:① cos2α=2 cos2 α-1; ② cos 4α=8 cos4 α-8 cos2 α+1; ③ cos 6α=32 cos6 α-
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观察下列等式:① cos2α=2 cos2 α-1; ② cos 4α=8 cos4 α-8 cos2 α+1; ③ cos 6α=32 cos6 α-
观察下列等式:① cos2α=2 cos2 α-1; ② cos 4α=8 cos4 α-8 cos2 α+1; ③ cos 6α=32 cos6 α-
观察下列等式:① cos2α=2 cos2 α-1; ② cos 4α=8 cos4 α-8 cos2 α+1; ③ cos 6α=32 cos6 α-
题目应该是(2110福建文科题)
观察下列等式:
① cos2α=2 (cos α)^2-1;
② cos 4α=8 (cos )^4-8 (cosα)^2+1;
③ cos 6α=32 (cosα)^6-48 (cosα)^4+18( cosα)^2-1;
④ cos 8α= 128 (cosα)^8-256(cosα)^6+160 (cosα)^4-32 (cosα)^2+1;
⑤ cos 10α=m(cosα)^10-1280 (cosα)^8+1120(cosα)^6+n(cosα)^4+p(cosα)^2-1;
可以推测,m-n+p=
答案:962.
观察下列等式:
① cos2α=2 cos2 α-1;
② cos 4α=8 cos4 α-8 cos2 α+1;
③ cos 6α=32 cos6 α-48 cos4 α+18 cos2 α-1;
④ cos 8α= 128 cos8α-256cos6 α+160 cos4 α-32 cos2 α+1;
⑤ cos 10α=mcos10α-1280 cos...
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观察下列等式:
① cos2α=2 cos2 α-1;
② cos 4α=8 cos4 α-8 cos2 α+1;
③ cos 6α=32 cos6 α-48 cos4 α+18 cos2 α-1;
④ cos 8α= 128 cos8α-256cos6 α+160 cos4 α-32 cos2 α+1;
⑤ cos 10α=mcos10α-1280 cos8α+1120cos6 α+ncos4 α+p cos2 α-1;
可以推测,m-n+p= .
962
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