The corresponding medians of two similar triangles are 2 cm and 5 cm. What is the ratio of their areas?

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A: According to the company rule we can answer only first question and rest can be reposted.

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Q: Why the final answer is 4sin(1+x)?

A: To simplify 4 sin 5x cos 6x+4 cos 5x sin 6x.To justify whether the final answer is 4 sin1+x.