<commit_before>#ifndef STAN_MATH_PRIM_SCAL_FUN_SQUARED_DISTANCE_HPP
#define STAN_MATH_PRIM_SCAL_FUN_SQUARED_DISTANCE_HPP

#include <stan/math/prim/scal/err/check_finite.hpp>

namespace stan {
  namespace math {

    /**
     * Returns the squared distance.
     *
     * @param v1 First vector.
     * @param v2 Second vector.
     * @return Dot product of the vectors.
     * @throw std::domain_error If the vectors are not the same
     * size or if they are both not vector dimensioned.
     */<commit_msg>Adding include for squared_distance<commit_after>#ifndef STAN_MATH_PRIM_SCAL_FUN_SQUARED_DISTANCE_HPP
#define STAN_MATH_PRIM_SCAL_FUN_SQUARED_DISTANCE_HPP

#include <stan/math/prim/scal/err/check_finite.hpp>
#include <cmath>

namespace stan {
  namespace math {

    /**
     * Returns the squared distance.
     *
     * @param v1 First vector.
     * @param v2 Second vector.
     * @return Dot product of the vectors.
     * @throw std::domain_error If the vectors are not the same
     * size or if they are both not vector dimensioned.
     */
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