18) Prove that : CosA - SinA + 1 / Cos A + Sin A - 1 = 1 + Sin A / Cos A
Answers
Answered by
0
Answer:
We have,
1+csosA−sinA
1+cosA+sinA
=
1+cosA−sinA
1+cosA+sinA
×
(1+cosA)+sinA
(1+cosA)+sinA
=
(1+cosA)
2
−sin
2
A
((1+cosA)+sinA)
2
=
1+cos
2
A+2cosA−1+cos
2
A
(1+cosA)
2
+sin
2
A+2(1+cosA)sinA
=
2cos
2
A+2cosA
1+cos
2
A+sin
2
A+2cosA+2sinA+2sinAcosA
=
2cos
2
A+2cosA
1+cos
2
A+sin
2
A+2cosA+2sinA+2sinAcosA
2cosA(1+cosA)
1+1+2cosA+2sinA+2sinAcosA
2cosA(1+cosA)
2+2cosA+2sinA+2sinAcosA
cosA(1+cosA)
1+cosA+sinA+sinAcosA
=
cosA(1+cosA)
1+sinA+cosA(1+sinA)
=
cosA(1+cosA)
(1+sinA)(1+cosA)
=
cosA
1+sinA
Hence proved.
Step-by-step explanation:
PLS MARK IT AS BRAINLIEST
Answered by
1
Answer:
- Prove that : CosA - SinA + 1 / Cos A + Sin A - 1 = 1 + Sin A / Cos A
Step-by-step explanation:
- LHS = cosA /(1-sinA ) + sinA / (1-cosA) + 1
- = [ COSA (1-cosA)+sinA(1-sinA)+(1-sinA) (1-COSA) ]/
- (1-sinA ) (1- cosA)
- = [ cosA -cos² A+ sinA - sin² A +1 -cosA-sinA +sinAcosA]/(1-sinA) (1 COSA)
- =[-(cos²A + sin² A) + 1+ sinAcosA ] / (1-sinA)(1-cosA)
- = [-1 + 1 + sinAcosA ]/(1- sinA ) ( 1- cosA)
- = sinAcosA / (1-sinA) (1 - cosA)
- = RHS
please make it a brainliest answer.
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