I assume you're supposed to establish the identity,
cos(A) cos(2A) cos(4A) = 1/8 sin(8A) / sin(A)
Recall the double angle identity for sine:
sin(2<em>x</em>) = 2 sin(<em>x</em>) cos(<em>x</em>)
Then you have
sin(8A) = 2 sin(4A) cos(4A)
sin(8A) = 4 sin(2A) cos(2A) cos(4A)
sin(8A) = 8 sin(A) cos(A) cos(2A) cos(4A)
==> sin(8A)/(8 sin(A)) = cos(A) cos(2A) cos(4A)
as required.
The baker uses 336 ounces in 2 weeks.
The y is 9:EXAMPLE took the test
Answer:
the answer is 0.1 dime
Step-by-step explanation:
2 1/2 % = 2.5%
2.5% of 4 = 4 * 2.5/100
= 0.1 dime
Amount left with Mathew = 4 - 0.1 = 3.9 dimes
Mathew has 3.9 dimes left with him.
The inverse sin of 1, ie sin-1 (1) is a very special value for the inverse sine function. Remember that sin-1(x) will give you the angle whose sine is x . Therefore, sin-1 (1) = the angle whose sine is 1.
