1.

Sin (270° – x) equals to ______(a) -cos x(b) cot x(c) -cosec x(d) sec xThis question was addressed to me in final exam.The above asked question is from Trigonometric Ratios of Complementary Angles topic in portion Trigonometry of Mathematics – Class 10

Answer»

Correct OPTION is (a) -cos x

For explanation I would say: (270° – x) refers to the third QUADRANT which LIES in the RANGE from 90° to 270°. Tan and cot are only positive in the third quadrant and sine changes to COSINE when it is 90° or 270°.

Sin (270° – x) = -Cos x



Discussion

No Comment Found

Related InterviewSolutions