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If (1+secA)/tanA=x, then x is

  1. A
    cot(A/2)
  2. B
    tan(A/2)
  3. C
    csc(A/2)
  4. D
    sec(A/2)

Solution & Step-by-step Explanation

Given expression:
x=
tanA
1+secA


Convert the terms into sine and cosine:

x=
cosA
sinA


1+
cosA
1



=
cosA
sinA


cosA
cosA+1



=
sinA
1+cosA


Using half-angle trigonometric formulas:

1+cosA=2cos
2
(
2
A

)
sinA=2sin(
2
A

)cos(
2
A

)
Substitute these identities back into the expression:

x=
2sin(
2
A

)cos(
2
A

)
2cos
2
(
2
A

)

=
sin(
2
A

)
cos(
2
A

)

=cot(
2
A

)

Practice this question

Try it yourself before checking the explanation above.

If (1+secA)/tanA=x, then x is
A
cot(A/2)
B
tan(A/2)
C
csc(A/2)
D
sec(A/2)

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