Q. 14.2( 140 Votes )

cos x = –<i

Answer :

Given: , x lies in 3rd quadrant

Sign Convention: For knowing the sign of Identities we will take the Graph Shown below which shows in which Quadrant which Trigonometric Ratio is Positive.



We know the identity:

sin x + cos x = 1

Putting the value of cos x from the question we get,




( x lies in 3rd quadrant)


Now,





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