Question

cos^2 17 + sin^2 73 ?​

Answer 1

Answer:

please mark me brainlist

Step-by-step explanation:

To find the value of cos²17-sin²73

We know that,

sin(90-x)=cos x

→sin²(90-x)=cos²x

Here,

sin²73

=sin²(90-17)

=cos²17

Now,

cos²17-cos²17

=0

Answer 2

Answer:

The answer will be 2(sin^2 73).

Step-by-step explanation:

We have given;

                      = cos^2 17 + sin^2 73;

Now, we know that angle property in trigonometry;

    that states              cos θ = sin (90 - θ );

Hence,  cos^2 17 = (cos 17)^2;

             (cos 17)^2 = (sin (90 - 17))^2;

              (cos 17)^2 = (sin 73)^2;

              cos^2 17 = sin^2 73;

Now, put this value of cos^2 17 in the given equation;

                      = sin^2 73  + sin^2 73

                      =  2(sin^2 73);

So, this is our answer.

That's all.