The following questions given below consist of an ‘assertion’
A
and ‘Reason (R) type questions. Use the following key to choose the appropriate answer. If both and (R) true and (R) is the correct explanation of . and (R) true but (R) is not correct explanation of . is true and (R) is false. is false but (R) is true. (i) Assertion: Differentiation of tanx w.r.t. x is sec 2 x. Reason: Integration of cosec 2 x is – cotx w.r.t. x. (ii) Assertion: The value of 1 + cot 2 x is sec 2 x. Reason: Value of 1 + tan 2 x is sec 2 x. (iii) Assertion : Magnitude of resultant of two vectors 
and 
will be A – B when angle between 
and 
is 180º. Reason: Magnitude of resultant of two vectors having equal magnitude when angle between them is θ is 2A sin θ /2. (iv) Assertion: 
= ab cos θ Reason: 
then 
= 0
and will be A – B when angle between and is 180º. Reason: Magnitude of resultant of two vectors having equal magnitude when angle between them is θ is 2A sin θ /2. (iv) Assertion: = ab cos θ Reason: then = 0
B
If both
C
If
D
If
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION
Ans.
(i)
Sol.
(ii)
Sol.
(iii)
Sol.
(iv)
Sol.
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