If cos (20+theta)=sin 30 degree,then the value of theta is what
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Answered by
4
let's cosider O to be as the sign for theta is not available.
cos(20+O)=sin30
cos20°+cosO=cos60°
cosO=cos60°+cos20°
cosO= cos80°
O=80°
theta=80°
cos(20+O)=sin30
cos20°+cosO=cos60°
cosO=cos60°+cos20°
cosO= cos80°
O=80°
theta=80°
Answered by
17
cos(90-theta) = sin(theta)
cos( 20+theta) = cos(90-30)
20 + theta = 90-30
20 + theta = 60
theta = 40
cos( 20+theta) = cos(90-30)
20 + theta = 90-30
20 + theta = 60
theta = 40
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