Question
If cosec (2A + B) = 2 and cosec (A + B) = 1, find the
value of (3A – B).Solution
We have, cosec (2A + B) = 2
Or, cosec (2A + B) = cosec 150°
Or, 2A + B = 150° -------- (I)
And, cosec (A + B) = 1
Or, cosec (A + B) = cosec 90°
Or, A + B = 90° ------- (II)
On subtracting equation (II) from (I),
We have, (2A + B) – (A + B) = 150° – 90°
So, A = 60°
Put the value of A = 60° in equation (II),
So, 60° + B = 90°
Or, B = 30°
Therefore, required value = (3 × 60°) – 30° = 150°
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‘ BENEFICIAL ’
...Four letter-clusters have been given out of which four are alike in some manner and one is different. Select the one that is different.
In the following question, select the odd word from the given alternatives.
In the following question, select the option which is different from the other three options.
Four of the following five pair of letter cluster are alike in a certain manner and one is different. Select the one which is different.
Find the odd word pair out from the given options.
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