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Q.


Which of the following statements are true?

1)     The value of tan A is always less than 1.


2)     sec A = 12 5  ,for some value of angle A.


3)     cos A is the abbreviation used for the cosecant of angle A.


4)     cot A is the product of cot and A.


5)     sin θ = 4 3  ,for some angle θ  .


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a

1,3,5

b

2,4

c

2

d

1,2,4 

answer is C.

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Detailed Solution

Given, the value of tan A is always less than 1.
The range of the function f(x) = tan(x) is from negative infinity to positive infinity.
This means that it can have any real value.
So, statement 1 is false.
Given, sec A = 12 5  ,for some value of angle A.
The range of the function f(x) = sec(x) is (,1)(1,)  . So, for some value of ‘A’, it can have the value 12 5  .
Hence, statement 2 is true.
Given, cos A is the abbreviation used for the cosecant of angle A.
cos(x) is the abbreviation for cosine(x), not cosecant(x).
So, statement 3 is false.
Given, cot A is the product of cot and A.
cot(A) is the abbreviation of cotangent(A).
So, statement 4 is false.
sin θ = 4 3  ,for some angle θ  .
The range of f(x) = sin(x) is [1,1]  . So, for no value of θ  , sin θ = 4 3   is true.
Hence, the statement 5 is false.
Only statement 2 is true.
Therefore, the correct option is 3.
 
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