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2 years ago

1+ cos^4 x-sin^4 x = 2 cos² x

1 answer:

7 0

$\text{L.H.S}\\\\=1+ \cos^4 x - \sin^4 x\\\\=1+ (\cos^2 x)^2 - (\sin^2 x)^2\\\\=1+(\cos^2 x + \sin^2 x)(\cos^2 x- \sin^2 x)\\\\=1+1\cdot(\cos 2x)\\\\=1+\cos 2x\\\\=2\cos^2 x\\\\=\text{R.H.S}\\\\\text{Proved.}$

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klemol [59]

Answer:

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3 years ago

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4 years ago

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Answer:

(b) 68

Step-by-step explanation:

Distance between two points:

Suppose that we have two points, $(x_1,y_1)$ and $(x_2,y_2)$ . The distance between them is given by:

$D = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

Diagonal:

Diagonals are a line between opposite points in a square.

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The correct answer is given by option b.

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3 years ago

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Burka [1]

Answer:

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4 years ago

1+ cos^4 x-sin^4 x = 2 cos² x​

1+ cos^4 x-sin^4 x = 2 cos² x