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![S[1] = `*`(`+`(`*`(`/`(1, 2), `*`(`*`(`/`(3, 2), 4), `*`(`^`(R, 2), `*`(`^`(cos, 2), `*`(alpha, `*`(sin))))))), alpha)](images/m_72.gif){kind=small}
![S[1] = `*`(`*`(`+`(`*`(6, `*`(`^`(R, 2), `*`(`^`(cos, 2))))), `+`(`*`(`/`(1, 2), `*`(alpha)))), `*`(sin, `*`(alpha)))](images/m_73.gif){kind=small}