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See

Brown, Edward, The cohomology of $B\text{SO}_n$ and $B\text{O}_n$ with integer coefficients. Proc. Amer. Math. Soc. 85 (1982), no. 2, 283–288

for an answer to your questions. (As for applications: the paper is referenced in other papers and at least one of these uses it to obtain a result singularity theory.)

If I remember correctly, the computation is quite elaborate, even to state.

Added: the following also does the computations.

Feshbach, Mark, The integral cohomology rings of the classifying spaces of $\text{O}(n)$ and $\text{SO}(n)$. Indiana Univ. Math. J. 32 (1983), no. 4, 511–516.

See

Brown, Edward, The cohomology of $B\text{SO}_n$ and $B\text{O}_n$ with integer coefficients. Proc. Amer. Math. Soc. 85 (1982), no. 2, 283–288

for an answer to your questions. (As for applications: the paper is referenced in other papers and at least one of these uses it to obtain a result in singularity theory.)

If I remember correctly, the computation is quite elaborate, even to state.

Added: the following also does the computations.

Feshbach, Mark, The integral cohomology rings of the classifying spaces of $\text{O}(n)$ and $\text{SO}(n)$. Indiana Univ. Math. J. 32 (1983), no. 4, 511–516.

See

Brown, Edward, The cohomology of $B\text{SO}_n$ and $B\text{O}_n$ with integer coefficients. Proc. Amer. Math. Soc. 85 (1982), no. 2, 283–288.

for an answer to your questions. (As for applications: the paper is referenced in other papers and at least one of these uses it to obtain a result singularity theory.)

If I remember correctly, the computation is quite elaborate, even to state.

See

Brown, Edward, The cohomology of $B\text{SO}_n$ and $B\text{O}_n$ with integer coefficients. Proc. Amer. Math. Soc. 85 (1982), no. 2, 283–288

for an answer to your questions. (As for applications: the paper is referenced in other papers and at least one of these uses it to obtain a result singularity theory.)

If I remember correctly, the computation is quite elaborate, even to state.

Added: the following also does the computations.

Feshbach, Mark, The integral cohomology rings of the classifying spaces of $\text{O}(n)$ and $\text{SO}(n)$. Indiana Univ. Math. J. 32 (1983), no. 4, 511–516.

See

Brown, Edward, The cohomology of $B\text{SO}_n$ and $B\text{O}_n$ with integer coefficients. Proc. Amer. Math. Soc. 85 (1982), no. 2, 283–288.

for an answer to your questions. (As for applications: the paper is referenced in other papers and at least one of these uses it to obtain a result singularity theory.)

If I remember correctly, the computation is quite elaborate, even to to state.

See

Brown, Edward, The cohomology of $B\text{SO}_n$ and $B\text{O}_n$ with integer coefficients. Proc. Amer. Math. Soc. 85 (1982), no. 2, 283–288.

for an answer to your questions. (As for applications: the paper is referenced in other papers and at least one of these uses it to obtain a result singularity theory.)

If I remember correctly, the computation is quite elaborate, even to state.