Page 102 - Math Grade 11 (Basic)

PROEUS DARA

n. sin3a = 4sinasinG+a)sinG-a)

2. cos3a = 4cosacosG +a) sinG a)

ill. sina- cosa = J2sin( a-~) = -J2sin( a+~)

B

. A sinB + sinC
n. sm = -=----=
cosB+ cosC
2. sinC = sinA + cosAcotC dl1Jfi~nH1Iltnb '1
cosB

A c

sinA = 2sinBsinC dl~~FIH1IIftHHfln '1

, ..
12. t?i'tfl!:l 11ABC Sb A, B, C dl~iib1f~tfilrult2g '1
I
n. tUt?i~bGl sinA+ sinB+ sinC = l ?iruls-1 cos~cos}cos~ '1

2 2 2
2. UblmG"l cos A+cos B+cos C = 1 2cosAcosBcosC
Ul -...!>
I 0">:1 Q
13. ?i n.n s-,~m M~t2Lntmn.n ABC cu t?i~bm A
4 I
n. sin3A + sin3B + sin3C = 0

2. sin5A + sin5B + sin5C = 0
B c
?i. sin6A + sin6B + sin6C = 0 '1

97