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```				   Hello there:
I have been trying to do the following integral but have not been successful. Could someone please lend a hand?
1 / (sin(x) + sec(x))
Thanks a ton!Manish
```

7 years ago

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```										∫dx/(sin x+sec x)=∫dx/(sin x + (1/cos x))=∫cos x dx /(1+sin x cos x)
Multiplying by 2, we get = ∫2 cos x dx / (2 + 2 sin x cos x)
2 cos x dx can be substituted with (cos x + sin x) + (cos x - sin x) and
2 + 2 sin x cos x can be substituted with either (3 - (sin x - cos x)2) or (1 + (sin x + cos x)2)
Hence we get,
∫2 cos x dx / (2 + 2 sin x cos x) = ∫ (cos x + sin x) dx / (3 - (sin x - cos x)2) + ∫(cos x - sin x) dx / (1 + (sin x + cos x)2)
FIRST PART OF THE INTEGRAL
∫ (cos x + sin x) dx / (3 - (sin x - cos x)2)
Integrate by substitution, put y = sin x - cos x
then dy = (cos x +sin x) dx,
and we get ∫ dy / (3 - y2) = (1/(2*√3)) [ ∫ dy / (√3 + y) +  ∫ dy / (√3 - y) ]
=> (1/(2*√3)) [ log(√3 + y) -  log(√3 - y) ] + C
replacing y with its original value, we get
=> (1/(2*√3)) [ log(√3 + (sin x - cos x)) -  log(√3 - (sin x - cos x)) ] + C

SECOND PART OF THE INTEGRAL
∫(cos x - sin x) dx / (1 + (sin x + cos x)2)
Integrate by substitution, put z = sin x + cos x
then dz = (cos x - sin x) dx,
and we get ∫dz / (1 + (z)2)
Let z = tan Θ, then dz = sec2Θ dΘ
∫dz / (1 + (z)2) = ∫sec2Θ dΘ / (1 + (tan Θ)2) = ∫sec2Θ dΘ / sec2Θ = ∫dΘ = Θ = tan-1z + C
replacing z with its original value, we get,
=> tan-1(sin x + cos x)+ C

Now adding the first and second parts, we get the result as
=> (1/(2*√3)) [ log(√3 + (sin x - cos x)) -  log(√3 - (sin x - cos x)) ] + tan-1(sin x + cos x)+ C

```
7 years ago
```										Hi, the integral is

∫ cosx dx / (sinx + cosx)
= 1/2 [2 cosx dx /(sinx + cosx)
= 1/2 [(cosx + sinx) + (cosx - sinx) dx] / (sinx + cosx)
Now divide individually
put sinx + cosx = t and integrate

x/2  +  1/2  log I sinx + cosx I  + c

```
6 years ago

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