Cos x is negative and sin x is negative.Which of the following is true of x?

Assessment: WAEC SSCE - General Mathematics - 1998 (Objective) Subject: General Mathematics

Question 1 Report

Cos x is negative and sin x is negative.Which of the following is true of x?

0^o < x < 90^o

90^o < x <180^o

180^o < x < 270^o

270^o < x <360^o

-90^o < x <90^o

Answer Details

If both cosine and sine are negative, it means the angle x is in the third quadrant of the unit circle where both coordinates x and y are negative. Therefore, the possible range for x is from 180 degrees to 270 degrees. Hence, the correct option is: - 180^o < x < 270^o

Read lesson note on Sine, Cosine And Tangent Of An Angle (WAEC)

Read lesson note on Introductory Calculus (WAEC)

Sine, Cosine And Tangent Of An Angle

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