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Q.

The number of solutions of tanx+secx=2cosx in [0,2π ] is ____________

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answer is 2.

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Detailed Solution

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The given equation is tanx+secx=2cosx

This can be written as sinxcosx+1cosx=2cosx

Here the condition  is cosx0

and the equation is 

   1+sinx=2cos2x =21-sin2x =21-sinx1+sinx

It implies that 1+sinx=0sinx=-1x=3π2, but this is not solution for the given equaiton because cos3π2 is zero. 

And 

1-sinx=12sinx=12x=π6,5π6

Therefore, the number of solutions for the given equation is 2

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