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We prove that $$ \prod_{n=0}^{\infty}(1+q^{10n+5}) =\frac{\sum_{n=-\infty}^{\infty}q^{n^{2}}\, \sum_{n=-\infty}^{\infty}(-1)^{n}\,(-q)^{n(3n-1)/2}}{4\, \sum_{n\geq 0}(-q)^{\frac{n(n+1)}{2}}\sin\left\{\frac{(2n+1)3\pi}{10}\right\}\, \sum_{n\geq0}(-q)^{\frac{n(n+1)}{2}}\sin \left\{\frac{(2n+1)\pi}{10}\right\}} \qquad |q|<1$$ using identities due to Ramanujan.

An identity for $(-q^{5};\,q^{10})_{\infty}$