sin²π/8 -cos²π/8
sin²π/8 -cos²π/8
求SINπ/64 COSπ/64 COSπ/32 COSπ/16 COSπ/8
求下列各式的值.第一题sin 15°cos 15° 第二题cos²π/8-sin²π/8
(cosπ/8+sinπ/8)(cos^3π/8-sin^3π/8)
(cos π/8+ sin π/8 ) (cos^3 π/8+sin^3 π/8 )的值.
8sin(π/32)cos(π/32)cos(π/16)cos(π/8),求值
求SINπ/64 COSπ/64 COSπ/32 COSπ/16 COSπ/8!急救急救
cos sin π √
【1】化简:sin(a-5π)/cos(3π-a)×cos(π/2-a)/sin(a-3π)×cos(8π-a)/sin
化简sin(α-5π)/cos(3π-α)×cos(π/2-α)/sin(α-3π)×cos(8π-α)/sin(-α-
设f(α)=2sinαcosα+cosα/1+sin²α+cos(3π/2+α)-sin²(π/2+
已知tan(3π+α)=2,求:1、(sinα+cosα)²;2、sinα-cosα/2sinα+cosα