【初中數學公式】, Bar 數學, Purasbar

The author has 226 posts.

	Floor 193 啊啊是谁都对 6/30/13 17:37 ctg(A/2)=√((1+cosA)/((1-cosA))
	Floor 194 啊啊是谁都对 6/30/13 17:37 ctg(A/2)=-√((1+cosA)/((1-cosA))
	Floor 195 啊啊是谁都对 6/30/13 17:37 2sinAcosB=sin(A+B)+sin(A-B)
	Floor 196 啊啊是谁都对 6/30/13 17:38 2cosAsinB=sin(A+B)-sin(A-B)
	Floor 197 啊啊是谁都对 6/30/13 17:38 2cosAcosB=cos(A+B)-sin(A-B)
	Floor 198 啊啊是谁都对 6/30/13 17:38 2cosAcosB=cos(A+B)-sin(A-B) -2sinAsinB=cos(A+B)-cos(A-B)
	Floor 199 啊啊是谁都对 6/30/13 17:38 sinA+sinB=2sin((A+B)/2)cos((A-B)/2
	Floor 200 啊啊是谁都对 6/30/13 17:38 cosA+cosB=2cos((A+B)/2)sin((A-B)/2)
	Floor 201 啊啊是谁都对 6/30/13 17:38 tanA+tanB=sin(A+B)/cosAcosB
	Floor 202 啊啊是谁都对 6/30/13 17:38 tanA-tanB=sin(A-B)/cosAcosB