cos 48 x 13 should equal 8. something but its equals 0.01 something what have i done wrong?
+118608 $$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{cos}}{\left({\mathtt{48}}^\circ\right)}{\mathtt{\,\times\,}}{\mathtt{13}} = {\mathtt{8.698\: \!697\: \!882\: \!667}}$$
$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{cos}}{\left({\mathtt{48}}{\mathtt{\,\times\,}}{\mathtt{13}}\right)} = -{\mathtt{0.104\: \!528\: \!463\: \!268}}$$
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+128399 Make sure your calculator is in "degree" mode......then, just evaluate
13*cos(48) .....you should get the correct answer......
+118608 $$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{cos}}{\left({\mathtt{48}}^\circ\right)}{\mathtt{\,\times\,}}{\mathtt{13}} = {\mathtt{8.698\: \!697\: \!882\: \!667}}$$
$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{cos}}{\left({\mathtt{48}}{\mathtt{\,\times\,}}{\mathtt{13}}\right)} = -{\mathtt{0.104\: \!528\: \!463\: \!268}}$$
