Write first 4 terms of `(1-(2y^2)/(5))^7`

Explanation

To find the first four terms of the expansion of \((1 - \frac{2y^2}{5})^7\), we can use the Binomial Theorem. The Binomial Theorem states that:

\[ (a + b)^n = \sum_{k=0}^{n} \binom{n}{k} a^{n-k} b^k \]

In our case, we can rewrite the expression as:

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