Jawabanmu

2014-05-06T15:12:20+07:00
A. sin²α + cos²α=1
b. 1+ tan²α= sec²α
c. (sin α + cosα)²= 1+2 sinα cosα
d. (sinα-cosα)²+ 1-2 sinα cosα
e. (sin α- cosα) (sin α + cosα) = sin²α- cos²a