Question

find the value of sec 240​

Answer 1

Answer:

Since sec 240 =sec (180 +60)

= -sec 60 (since 180 is multiple of 90 so trigonometric ratios will not change)

= -sec 60 (according to ASTC rule 180 +60 lies in 3rd quadrant where tan and cot are positive and others are negative so it will be - sec 60)

Since - sec 60 = - 2

So sec 240 = - 2