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

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

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

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

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

2sin45^(@)cos45^(@)

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

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

Prove that: i) sin(A+B)cos(A-B)-cos(A+B)sin(A-B)=sin2B ii) cos(45^(@)-A)cos(45^(@)-B)-sin(45^(@)-A)sin(45^(@)-B)=sin(A+B)

Prove that: i) sin(A+B)cos(A-B)-cos(A+B)sin(A-B)=sin2B ii) cos(45^(@)-A)cos(45^(@)-B)-sin(45^(@)-A)sin(45^(@)-B)=sin(A+B)

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

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