Question

if cos (a+b) = 1/2 and sin (a-b) = 1/2 ,then angle b =​

Answer 1

Answer:

cos 60

sin 30

since sin 30=cos 60

then cos(a+b)=60°=cos(a-b)

a+b=60

+

a-b=60

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2a=120

a=60

sub in a-b.....

60-b=60

-b=0

b=0