Proof without words: The Cosine of difference

H. ÜNAL, "Proof without words: The Cosine of difference," *Mathematics and Computers Education* , vol.44, no.2, 2010

ÜNAL, H. 2010. Proof without words: The Cosine of difference. *Mathematics and Computers Education* , *vol.44, no.2* .

ÜNAL, H., (2010). Proof without words: The Cosine of difference. *Mathematics and Computers Education* , vol.44, no.2.

ÜNAL, Hasan. "Proof without words: The Cosine of difference," *Mathematics and Computers Education* , vol.44, no.2, 2010

ÜNAL, Hasan. "Proof without words: The Cosine of difference." *Mathematics and Computers Education* , vol.44, no.2, 2010

ÜNAL, H. (2010) . "Proof without words: The Cosine of difference." *Mathematics and Computers Education* , vol.44, no.2.

@article{article, author={Hasan ÜNAL}, title={Proof without words: The Cosine of difference}, journal={Mathematics and Computers Education}, year=2010}