identities Flashcards
1
Q
cosh and sinh ID
A
cosh^2 x - sinh^2 x = 1
2
Q
tanh and sech ID
A
1 - tanh^2 x = sech^2 x
3
Q
coth and cosech ID
A
coth^2 x - 1 = cosech^2 x
4
Q
cos 2x
A
cos^2 x - sin^2 x
OR
2cos^2 - 1
5
Q
sin 2x
A
2cosxsinx
