what are the steps to find cos(28) and sin(28) because i want to find cos(28)-sin(28)
Just put it straight into the home page calc as it is.
$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{cos}}{\left({\mathtt{28}}^\circ\right)}{\mathtt{\,-\,}}\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}{\left({\mathtt{28}}^\circ\right)} = {\mathtt{0.413\: \!476\: \!030\: \!073}}$$
Just put it straight into the home page calc as it is.
$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{cos}}{\left({\mathtt{28}}^\circ\right)}{\mathtt{\,-\,}}\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}{\left({\mathtt{28}}^\circ\right)} = {\mathtt{0.413\: \!476\: \!030\: \!073}}$$