Prove the above question and i will give you.​

see explanation

Step-by-step explanation:

Using the identity

cos²A - sin²B = cos(A + B) . cos(A - B)

Here A = + , B = -

Consider the left side

cos²( + ) - sin²( - )

= cos( + + - ) × cos( + - + )

= cos ( ) × cos ( A)

= cosA

=  right side , thus proven

the first dot plot best represents the data

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