Please help me 20 points Where does the Pythagorean Identity sin2 Θ + cos2 Θ = 1 come from? Given the Cos Θ = 4/5, how would you use it to find the sine and tangent values of the angle? Explain.

Step-by-step explanation:

Kindly refer to the attached image of a right angled .

Let

Sides BC = a

AB = c and

AC = b respectively.

To prove:

Proof:

Using Sine and Cosine values:

As per Pythagorean theorem:

Considering the LHS of :

Now, using equation (1):

Hence, proved that :

Now, we are given that:

To find, sine and cosine values of the angle i.e. and

Using :

We know that:

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21/58.

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