Page 135 - Math SL HB Sem 1

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ll . SMaxinum nark t)l

(o) Considtr lhe equatiou 4 r! + ,Lr + 1 = 0 - For what v-alues of & does tfris equalioa
lrave rs'o equal roots?
hnS, L.4 r-tf [3 narkJ

Let / be tlre fi.nrctioa (e) 2cos20 + 4cos 6 +3 for -360' <6 < 360. _
.f
=
,
/(g)=,f [] narkl
(b) Slovi t-hat rhis f,ilchoo ruay be rvrifieo as gos,6+4cos0+I-
(.) Colsider the equation
"f@)=0. for -j60.<d <360'.
h^c:l
(, How nany dishnctvalues of cos6 satis$ rhis equatioa? h, I . 0 : 2y o ,124 ,- >44

-t>a
(") Find all r.alues of I r{rich satisfu this equatiorl.
[5 narkJ
(d) Grven tlat
,/(0) = c x satrsfiecl by ouly three values of 0, fild the r,,alue ofc, p marksl
A't' ( I

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