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cos (45^(@) –A) cos (45^(@) –B) - sin (...

`cos (45^(@) –A) cos (45^(@) –B) - sin (45^(@) –A) sin (45^(@) –B) =sin (A+B)`

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sin(45^@+A)sin(45^@-A)=

( cos (45^(@) + A) - cos (45^(@) - A))/( sin (120^(@) + A)-sin(120^@-A))=

cos (A +B) + sin (A -B) = 2 sin (45 ^(@) + A) cos ( 45 ^(@) + B).

(cos (45 ^ (@) + A) -cos (45 ^ (@) - A)) / (sin (120 ^ (@) + A) -sin (120 ^ (@) - A)) =

cos 45^(@)-sin 45^(@)=?

sin^(2)45^(@)+cos^(2)45^(@)=

sin 45^(@)(cos 45^(@)) =…………..

2sin45^(@)cos45^(@)

If A = sin 45^(@) + cos 45^(@) and B= sin 44^(@) + cos44^(@) , then: