Question

1-cos2a, если sina=1/корень5

Answer 1

Ответ:

Объяснение:

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Answer 2

To find the value of 1 - cos^2(a) given that sin(a) = 1/√5, we can use trigonometric identities. One useful identity is:

1 - cos^2(a) = sin^2(a)

So, let's start by finding the value of sin^2(a):

sin^2(a) = (sin(a))^2 sin^2(a) = (1/√5)^2 sin^2(a) = 1/5

Now, we can use the identity:

1 - cos^2(a) = sin^2(a)

Substitute the value of sin^2(a):

1 - cos^2(a) = 1/5

Therefore, the value of 1 - cos^2(a) is 1/5.