In one grade of 150150 students, the ratio of boys to girls is 2 : 3 . How many boys are in that grade?
1 answer:
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Answer:
The Pythagorean identity states that
Using that we can rewrite the left denominator as:
Which can be factored as
The numerator we can expand as:
On the right hand side, let's multply numerator and denominator with (1 - sin t):
The total formula then becomes:
There you go... left and right are equal.