If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

We are given that:

Now we are asked to show that:

We know that:

Hence using equation (1) we get:

Also we know that:

and

so using above two formula in equation (2) we get:

( since we know that:

)

Hence we have proved that:

costs the what? what is the cost of the pants?

step-by-step explanation:

if it is $10, then the price is 14.

take 40% of the cost, and then add the cost.

40% of 10 = 4

4+10 = 14.