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" 1."cos(A+45^(@))cos(A-45^(@))=(1)/(2)(...

" 1."cos(A+45^(@))cos(A-45^(@))=(1)/(2)(cos^(2)A-sin^(2)A)

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2sin45^(@)cos45^(@)

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

(cos 45^(@))=1/(sqrt(2))

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

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

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

sin 45^(@)(cos 45^(@)) =…………..

Evaluate: ((sin47^(@))/(cos43^(@)))^(2)+((cos43^(@))/(sin47^(@)))^(2)-4cos^(2)45^(@)

Prove that: cos(45^(@)-A)cos(45^(@)-B)-sin(45^(@)-A)sin(45^(@)-B)=sin(A+B)