Question

if sin a=1/2 then find the value of cos a​

Answer 1

sin a=1/2
sin30=1/2
Therefore,
cos30=root3/2

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Answer 2

The value of cos a is √3/2.

Given,

The value of sin a = 1/2.

To Find,

The value of cos a.

Solution,

The value of sin a is 1/2

Now,

Using the trigonometric formula

sin²a + cos²a = 1

Now,

The value of sin²a = (1/2)² = 1/4

Substituting the value in the formula

1/4 + cos²a = 1

cos²a = 1-1/4

cos a = √(3/4)

cos a = √3/2

Hence, the value of cos a is √3/2.

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