Question

The product of sec 30° and cos 60° is _____

(a) 0

(b) 2

(c) 1

(d) \( \frac {1}{\sqrt 3}\)

This question was addressed to me in a national level competition.

My doubt stems from Trigonometric Ratios of  Specific Angles topic in chapter Trigonometry of Mathematics – Class 10

Answer 1

Correct option is (d) \( \frac {1}{\sqrt 3}\)

The explanation: (sec 30°) (cos 60°) = \(( \frac {2}{\sqrt 3}) ( \frac {1}{2} )\)

= \( \frac {1}{\sqrt 3}\)