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### Try stepping through the code

Value and type of last evaluated expression: Address of array element: Address of array elementx:  (none)

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### Code

``` Header...
//
// Demonstrate the trigonometric identity
// cos(a+b) equals cos(a)*cos(b) - sin(a)*sin(b)
//

int main(){   ...
»  double a, b, cos_a_plus_b, error;

»  a=0.707;//! Random values
»  b=0.1234;

»  cos_a_plus_b=cos(a)*cos(b)-sin(a)*sin(b);

»  error=cos_a_plus_b-cos(a+b);

»  printf("I calculate cos(%g) to be %g\n", a+b, cos_a_plus_b);
»  printf("with an error of %g\n", error);

»  return 0;
}
```

### Data

a (double) b (double) 4.24399158e-312 -2.01528465e+267 -8.38876602e+266 4.93925743e-270

Memory

### main()

128
129
130
131
132
133
134
135
a = 4.24399158e-312
136
137
138
139
140
141
142
143
b = -2.01528465e+267
144
145
146
147
148
149
150
151
cos_a_plus_b = -8.38876602e+266
152
153
154
155
156
157
158
159
error = 4.93925743e-270

NB: the actual memory address of each variable is the
```I calculate cos(0.8304) to be 0.674581