Page 117 - Math Grade 11 (Basic)

PROEUS DARA

4. t?l'l:fl!:l tana +tan~+ tany = tanatan~tany (-~<a, ~' y < ~) '1

?lbl..flSl~ (a+~+y)
l
<>
2
5. l:fi'i::fl2 a = cos 10° , 13 = cos50° , y cos 70 o '1 fi blil Sl a - 13 - y , a - l3y 2 b
a2 + 2 + y2 '1
13
6. -ummm
U1 ""
2
n. (1- sin A+ cosA) = 2( 1- sin A)( 1 +cos A)
1
2. cotA + tanA = -:.---
smAcosA
2 2
fi. (tanS+ sinS)( tanS- sine) = tan 8sin e

lli. ( 1 + si~e) ( 1- sine) = cosecotEl

7. t 1:fl81_,nflt1Ht5'i§ffl~21b t1_,fil'l:i :

n. 4cos\-cos2x-4cosx+ 1 = 0

u;. sm x + cos x cos x + sm x -
fi. 1 + sinx + cosx + sin2x + cos2x = 0 ••• . 4 4 2 1 . 22 2 = 0
4
2007 2007 2
b. sin x + cos x = 1 ti. tanx = cotx + 2cot 2x '1
2 2 2
8. n. &fi§J 2sinAcosA+(cosA+sinA) -(2cosA+sinA) =psin A+q

2
2. tfi~ sinxcosx(5tanx+2cotx) = a+bsin x '1
':1 ':1 0 c::t.
~nfit'i:H2ti2Stt:H a sb b '1
"" u

..... ( :rt) 2: - 2, 2. tan ( x- ~) 2: -1 '1
1
n. cos x + "3
10. ntH L nn tiHo~ m ~ 'ho~ m ~ 21 b tt, mY

2
n. 2sin El- JlcosEl = 0
11. 1:?1~ b.ABC 'l:fiS~ 3 ctl~1_,hlti '1
1.1
n. tibl mm tan A+ tanB + tanC = tan A· tanB · tanC
Ul ""
2. mb T = tan A+ tanB + tanC '1

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