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If tanθ=125tan θ= \frac{12}5tanθ=512​​, then (1+sinθ)(1−sinθ)\frac{(1+sinθ)}{(1- sin θ )} (1−sinθ)(1+sinθ)​​is:
Question

If tanθ=125tan θ= \frac{12}5​, then (1+sinθ)(1sinθ)\frac{(1+sinθ)}{(1- sin θ )} ​is:

A.

22

B.

24

C.

25

D.

20

Correct option is C

GIVEN:
tanθ=125,tan θ= \frac{12}5,​​
Solution:
Here using A instead of  tanθ=125,tan θ= \frac{12}5,​​
Cosec² A = 1 + cot² A
= 1 + ( 512\frac{5}{12}​ )²

= 1 + 25144\frac{25}{144}​= 144+25144\frac{ 144 + 25 } { 144}​​
169144\frac{169} { 144}​​

cosecA = √ ( 1312\frac{13}{12}​ )²
1sinA=1312\frac{1}{sinA} = \frac{13}{12}​​
Therefore ,
SinA = 1213\frac{12}{13}​​
1+sinA1sinA=1+121311213\frac{1+sin A}{1-sinA}=\frac{1+\frac{12}{13}}{1-\frac{12}{13}}​​
2513113\frac{\frac{25}{13}}{\frac{1}{13}}​​
=25

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