Math task finished.

.gitignore

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+target

Makefile

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+CC=gcc
+CFLAGS=-Wall -O3
+TDIR=target/
+
+objects = strings ll
+all: $(objects) maths
+
+maths: maths.c
+	$(CC) $(CFLAGS) -o $(TDIR)$@ $< -lm
+
+$(objects): %: %.c
+	$(CC) $(CFLAGS) -o $(TDIR)$@ $<

ll.c

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+#include <stdio.h>
+
+int main() {
+   printf("Hello, World!\n");
+   return 0;
+}

maths.c

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+#include <stdio.h>
+#include <math.h>
+
+// z_1 = cos(3pi / 8 - alpha / 4)^2 - cos(11pi / 8 + alpha / 4)^2
+// z_2 = sqrt(2) / 2 * sin(alpha / 2)
+
+int main() {
+    double alpha = 0, z_1 = 0, z_2 = 0;
+
+    printf("Input Ɑ: ");
+
+    if (scanf("%lf", &alpha) != 1){
+        printf("\e[1;31m[ERROR] Alpha must be a double, restart the program.\n\e[0m");
+        return 0;
+    }
+
+    z_1 = cos(3 * M_PI / 8 - alpha / 4) * cos(3 * M_PI / 8 - alpha / 4) - cos(11 * M_PI / 8 + alpha / 4) * cos(11 * M_PI / 8 + alpha / 4);
+    z_2 = sqrt(2) / 2 * sin(alpha / 2);
+
+    printf("z_1 = %lf\n", z_1);
+    printf("z_2 = %lf\n", z_2);
+
+    return 0;
+}

strings.c

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+#include <stdio.h>
+
+int main() {
+   printf("Hello, World!\n");
+   return 0;
+}