Question

7. If cos X=a/b, then sin X is equal to: (a)b2-a2/b (b)b-a/b (c)√(b2-a2)/b (d)√(b-a)/b

Answer 1

7. If cos X=a/b, then sin X is equal to:

(a)b2-a2/b

(b)b-a/b

(c)√(b2-a2)/b

(d)√(b-a)/b

Answer: (c)

Explanation: cos X=a/b

By trigonometry identities, we know that:

sin2X+cos2X=1

sin2X=1-cos2X = 1-(a/b)2

Sin X=√(b2-a2)/b

Answer 2

Hello Honey.............................

ItzBluePrincess