3 years ago

The quadrilateral has vertices A(3,5), B(2,0), C(7,0) and D(8,5). Which statement about the quadrilateral is true

Mathematics

1 answer:

viktelen [127]3 years ago

7 0

It is a parallelogram!

Also you haven't really put any other info...

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Verify the identity cos quantity x plus pi divided by two = -sin x

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Answer:

Identity is verified.

Step-by-step explanation:

We have to verify the identity $cos(x+\frac{\pi }{2}) = (- sinx)$

To prove any identity we always prove one side(either left hand side or right hand side) of the equation equal to the other side.

In this identity we take the left hand side first

$cos(x+\frac{\pi}{2})$

$=cosx\times cos(\pi/2)-sinx\times sin(\pi/2))$ (as we know cos(a+b) = cosa×cosb-sina×sinb)

$= cosx\times0-sinx\times1$

$= 0-sinx$

= - sinx ( Right hand side)

Hence identity is proved.

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$\qquad\qquad\huge\underline{\boxed{\sf Answer☂}}$

let's simplify ~

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