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सिद्ध कीजिए कि cos (45^(@) +A) cos ...

सिद्ध कीजिए कि
` cos (45^(@) +A) cos (45^(@) - A) = 1/2 cos 2 A`

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Prove that: cos(45^(@)+A) cos(45^(@)-A)=1/2 cos2A

sin (45 ^ (@) + A) sin (45 ^ (@) - A) = (1) / (2) cos2A

Prove that: cos(45^(@)+A) cos(45^(2)-A)=1/2 cos2A

Prove that cos (30^(@) -A ) cos (30^(@) + A ) + cos (45^(@) - A) cos (45^(@) + A) = cos 2A + (1)/(4) .

Value of cos(45^@ +x) + cos(45^@-x) =

Prove that: sin(45^(@)-A)=1/2cos2A

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

2sin45^(@)cos45^(@)

sin 45^(@)(cos 45^(@)) =…………..