Question

If seca=17/8 and cosecb=5/4 then sec(a+b) can have value ?

Answer 1

Step-by-step explanation:

Cosa = 8/17 = आधार/कर्ण

‌लम्ब = √289-64 = √225 = 15

Sina = 15/17

Sinb = 4/5 = लम्ब/कर्ण

आधार = √25-16 = √9 = 3

Cosb = 3/5

Cos(a+b) = Cosa*Cosb - Sina*Sinb

= (8/17)*(3/5) - (15/17)*(4/5)

= 24/85 - 60/85

= -36/85

Sec(a+b) = -85/36