Question

9. If cos A + cos? A = 1 then sin? A + sinA=?
a) 1
b) 1/2

c) 2
d)4​

Answer 1

Step-by-step explanation:

cosA+cosA=1

2cosA=1

cos A=2×1=2

cosA=2

sinA+sinA=

2sinA

sinA can be written as 1/cos A

2 ×1/cos A =

2×1/2=

2/2=1

answer is 1