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I think I've deciphered the 4th one . . .
. . . .
Hey I am also having a lot of trouble with these identities and I'm wondering if anyone knows how to work them??
secX/sinX - 2sinX/cosX = cotX - tanX
tanX - sinX / sin(cubed)X = secX / 1 + cosX
1 + 3sin(squared)X secX(to 4th power)X = sec(to the 6th power)X -tan(to the 6th power)X
tanX + cotX / secXcscX times tanX/sinX = secX
cosX + 1 / secX - tanX - 1 - cosx / secX + tanX = 2(1 + tanX)