PROVE THAT
(1+ sinA-COSA//
(I + sinA + COSA) =
(√I-COSA)/
(√I+COSA)
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Answer:
+
cosA
sinA
=
cosA
1
Hence
∣
cosA
1−sinA
∣=
cosA
1−sinA
.
Now
−1≤sinA≤1
Or
0≤1−sinA≤2.
Hence
∣1−sinA∣=1−sinA.
Hence we get
(1−sinA)(
∣cosA∣
1
−
cosA
1
)=0
Or
sinA=1 and A=
2
π
or
∣cosA∣=cosA. This implies Aϵ[−
2
π
,
2
π
].
Hence Ist and IVth quadrant
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