Question

if π=15a then prove that 16cosacos2acos4acos8a =-1​

Answer 1

$\green\bigstar$ correct answer

In the proportion, we saw how we can use the ratio of various quantities to analyze and compute the quantities themselves. Another very important concept that arises from the concept of proportion is the definition of proportional. In the following section, we shall define what we call a proportional and also solve many interesting examples of this concept. We will also define what we mean by the fourth proportional, the third proportional and the mean proportionals. Let us begin!