Question

sec 70° sin 20° + cos 20° cosec 70° = ?

विकल्प

• 0

• 1

• 2

• –2

Answer 1

2

Explanation:

Given expression = sec 70° sin (90° – 70°) + cos 20° cosec (90° – 20°) 

= sec 70° cos 70° + cos 20° sec 20°

= 1 + 1

= 2