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( )^2 = ( )^2 + ( )^2 - 2 . . /2 (1)
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( )^2 = ( )^2 + ( )^2 - 2 . . /2 (2)
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( )^2 = ( )^2 + ( )^2 - 2 . .
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= +
= 2 ^2 (/2) - 1
( )^2 = ( )^2 + ( )^2 + 2 .
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( )^2 + ( )^2 + 2 . = ( )^2 + ( )^2 - 4 . . ^2 (/2) + 2 . (3)
(1) (2) (3)
. = . + ( )^2 + /2 * [ (2 . /2 ) - ( + ) ] (4)
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= =
= * /2
= 1/2 *
(2 . /2 ) = 2 * * = .
( + ) = . ( + ) = .
: / = /
. = .
:
(2 . /2 ) = ( + )
(4)
. = . + ( )^2 + /2 * [ (2 . /2 ) - ( + ) ]
= . + ( )^2 + /2 * 0
180
90
/2 0
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. = . + ( )^2
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( )^2 = ( )^2 + ( )^2 - 2 . . /2 (1)
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( )^2 = ( )^2 + ( )^2 - 2 . . (180 -/2) = ( )^2 + ( )^2 + 2 . . /2 (2)
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( )^2 = ( )^2 + ( )^2 - 2 . . (180 - )
= ( )^2 + ( )^2 + 2 . .
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= -
= 2 ^2 (/2) - 1
( )^2 = ( )^2 + ( )^2 - 2 .
:
( )^2 + ( )^2 - 2 . = ( )^2 + ( )^2 + 4 . . ^2 (/2) - 2 . (3)
(1) (2) (3)
. = . - ( )^2 + /2 * [ (2 . /2 ) - ( - ) ] (4)
= =
= * /2
= 1/2 *
(2 . /2 ) = 2 * * = .
( - ) = . ( - ) = .
: / = /
. = .
:
(2 . /2 ) = ( - )
(4)
. = . - ( )^2 + /2 * [ (2 . /2 ) - ( - ) ]
= . + ( )^2 + /2 * 0
: /2 0
:
. = . - ( )^2
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