Answer:
3/4 * 2/5
Step-by-step explanation:
Areas is L * W
(1/5 + 1/5) * (1/4 + 1/4 + 1/4) = 2/5 * 3/4
it will take 3 hours long
or , where is an integer.
There are three such angles between and : , , and .
By the double angle identity of sines:
.
Rewrite the original equation with this identity:
Note, that and share the common factor . On the other hand, and share the common factor . Combine these terms pairwise using the two common factors:
Note the new common factor . Therefore:
This equation holds as long as either or is zero. Let be an integer. Accordingly:
Any that fits into at least one of these patterns will satisfy the equation. These pattern can be further combined: