Question

without using trigonometric tables evaluate​

Answer 1

Answer:

5

Step-by-step explanation:

cos70 = sin 20

as cos(90-x) = sin x

so, 7cos 70/2sin 20 =7/2 × 1 = 7/2

similarly ,

tan (90-x) = cot x

sec(90-x) = cosec x