$Cos^2x-Sin^2x=1-2sin^2x \\ Cos^2x-Sin^2=cos(2x) \\ 1-2sin^2=cos2x \\ cos(2x) =cos2x \\ \\ \\ Cos^2x-Sin^2x=1-2sin^2x \\ \mathrm{cos^2x+sin^2x=1 ~~~\Rightarrow ~~cos^2x=1-sin^2x} } \\ 1-sin^2x-sin^2x=1-2sin^2x \\ 1-2sin^2x=1-2sin^2x$

8 0

3 years ago

nine yards of ribbon are cut into 8 equal pieces. what is the length of each piece of ribbon? write a division expression to rep

Harlamova29_29 [7]

Each piece length will be 1/8 part of the whole piece, so as the total length is 9 yards then we will have that the lengh of each piece is one and eighth yard. The division expression is as follows: Piece length = 9 * 1/8 = 9/8 = (8+1)/8 = 8/8+1/8 = 1 + 1/8 = 1 + 0.125 = 1.125 yards

8 0

3 years ago

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What is the domain of the function y= cube root of x -1?

rosijanka [135]