Question

If cos(40+x)=sin30,find value of x

Answer 1

Answer:

Step-by-step explanation:

Cos(40°+x)=sin 30°=1/2. (Sin30°=1/2)

So cos (40+x)=1/2

Which means 40°+x=60°

because cos60°=1/2

Thus 40°+x=60

x=60°-40°=20°

X=20°

Answer 2

=> sin(90-40-x) = sin30

=> sin(50-x) = sin30

=> 50-x = 30

=> -x = -20

=> x= 20

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