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Answer:
cos(2x) = 2cos²(x)-1
Step-by-step explanation:
We know the trigonometry identity as follows :
cos(2x) = cos²(x) – sin²(x) ....(1)
Also, sin²(x)+cos²(x) = 1
or
sin²(x) = 1-cos²(x)
Put the value of sin²(x) in equation (1)
cos(2x) = cos²(x) – (1-cos²(x))
= cos²(x) –1+cos²(x)
cos(2x) = 2cos²(x)-1
Hence, 2cos²(x)-1 is equal to cos(2x).
Answer:
Step-by-step explanation:
Given
Length of Prism
Height of prism
width of prism
Now Volume of a prism is given by
Answer:
(x+6)(x+2)=0
Step-by-step explanation:
Diamond problem solve it.
a+b=8
a*b=12
a and b must be 6 and 2.
Answer:
x=4
y=1
Step-by-step explanation:
In the attached file