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√[(asin@-acos@)²+(acos@+asin@)²],
√[a²sin²@+a²cos²@-2a²sin@cos@ + a²cos²@+a²sin²@+2a²sin@cos@],
√[a²sin²@+a²cos²@+a²cos²@+a²sin²@],
√[2a²sin²@+2a²cos²@],
√[2a²(sin²@+cos²@)],
√[2a²],
√2a
√[a²sin²@+a²cos²@-2a²sin@cos@ + a²cos²@+a²sin²@+2a²sin@cos@],
√[a²sin²@+a²cos²@+a²cos²@+a²sin²@],
√[2a²sin²@+2a²cos²@],
√[2a²(sin²@+cos²@)],
√[2a²],
√2a
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