Page 108 - Math SL HB Sem 1
P. 108
CIRCULAR FUNCTIONS AND TRIG ONOMETRY
HALF ANGLE IDENTITIES
AA
srn A - 2s1n -cos -
22
A
cos A - 2cos2 j I
,
^.zA
: I -ZStn - 2
zA . tA
: cos-- stn-
22
2an4
tanA: 2
I tan'4
2
4-29
