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1 mark

If 2secA−
cosA
1+sinA

=x, then the value of x is:

  1. A
    1+sinA
    cscA
  2. B
    1+sinA
    cosA
  3. C
    cosA(1+sinA)
  4. D
    cscA(1+sinA)

Solution & Step-by-step Explanation

Given expression:
x=2secA−
cosA
1+sinA


Substitute secA=
cosA
1

:

x=
cosA
2


cosA
1+sinA


x=
cosA
2−(1+sinA)


x=
cosA
1−sinA


Multiply both the numerator and the denominator by (1+sinA) to match the given option formats:

x=
cosA(1+sinA)
(1−sinA)(1+sinA)


x=
cosA(1+sinA)
1−sin
2
A


Using the identity 1−sin
2
A=cos
2
A:

x=
cosA(1+sinA)
cos
2
A


x=
1+sinA
cosA

Practice this question

Try it yourself before checking the explanation above.

If 2secA−
cosA
1+sinA

=x, then the value of x is:
A
1+sinA
cscA
B
1+sinA
cosA
C
cosA(1+sinA)
D
cscA(1+sinA)

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