Q: What is the exact value of cos 30?

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It is: cos(15) = (sq rt of 6+sq rt of 2)/4

If tan 3a is equal to sin cos 45 plus sin 30, then the value of a = 0.4.

The exact value is an irrational number, and can't be written on paper with digits.0.34202 is less than 0.000042 percent wrong.Cos(70 deg) is an irrational number and it is impossible to give its exact value.

SQRT(3)/4 - 1/4

cos 34o ≈ 0.829 cos 34 = 0.86074

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cos(195) = -0.965925826289

negative one half

It is: cos(15) = (sq rt of 6+sq rt of 2)/4

30 degrees explanation 2Cosx-radical 3=0 Then 2cosx=radical 3 and cos x=(radical 3)/2 Now remember that cos 300 is (radical 3)/2 from the 30/60/90 triangle. So the answer is 30 degrees.

If tan 3a is equal to sin cos 45 plus sin 30, then the value of a = 0.4.

The exact value is an irrational number, and can't be written on paper with digits.0.34202 is less than 0.000042 percent wrong.Cos(70 deg) is an irrational number and it is impossible to give its exact value.

1.25

sin(75) = sin(45 + 30) = sin(45)*cos(30) + cos(45)*sin(30) = [1/sqrt(2)]*[sqrt(3)/2] + [1/sqrt(2)]*[1/2] = 1/[2*sqrt(2)]*[sqrt(3) + 1] that is [sqrt(3) + 1] / [2*sqrt(2)]

cos(30 = 0.8660254038

SQRT(3)/4 - 1/4

cos(30)cos(55)+sin(30)sin(55)=cos(30-55) = cos(-25)=cos(25) Note: cos(a)=cos(-a) for any angle 'a'. cos(a)cos(b)+sin(a)sin(b)=cos(a-b) for any 'a' and 'b'.

Cos(30) = sqrt(3)/2