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If xk = (sectheta)^(1/2^k)+ (tan theta)^...

If `x_k = (sectheta)^(1/2^k)+ (tan theta)^(1/(2^k) ` `and y_k = (sectheta)^(1/(2^k))-(tan theta)^(1/2^k)` , then value of `3y_n prod_(k=0)^n (x_k)` is equal to

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