Question

The word cosine literally means "the complement of the sine." Write a paragraph explaining how complements of sine and cosine are connected.

I know that the sine and the cosine of complementary angles are the same. but how can i add more details/write a paragraph?

Answer 1

COSINE was originally written "co.sine," short for COMPLEMENTI SINUS:
the sine of the complement. The COSINE of angle AOB is the sine of the
complementary angle (ABO ).


So Your question states it wrong. COMPLEMENTI SINUS does not mean the complement of the sine, it means the sine of the complement. And that, is exactly what it is. The sine of the complementary angle. The -I ending is for possessives