?
sec A-tan A
1 sec A+tan A
(a) (sec A-tan A)
(c) sec Atan A
(b) (sec A+tan A
(d) None of these
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Answer:
Correct option is D
Correct option is
D
cosA.
(secA+tanA)(1−sinA)
=(cosA1 + cos sinA)(1−sinA)
=( cosA1+sinA )
(1−sinA)= cosA
(1+sinA)
(1−sinA) ==cosA
(1−sin 2 A)= cosA
cos 2A
=cosA
∴(secA+tanA)(1−sinA)=cosA
Hence, the answer is cosA.
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