Foundation
Mathematics Foundation
Introduction to Trigonometry
Question
sec 70º sin 20º + cos 20º cosec 70º = ?
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Solution
Given expression = sec 70º sin (90º – 70º) + cos 20º cosec (90º – 20º)
= sec 70º cos 70º + cos 20º sec 20º = 1 + 1 = 2