" (3) IfG "sin A=(1)/(2)" a "cos2A" N dift unith "

Prove that (1 + sin2A) / (cos2A) = (cos A + sin A) / (cos A-sin A)

Prove that (i) cos (n + 2) x cos (n+1) x +sin (n+2) x sin (n+1) x = cos x) (ii) " cos " .((pi)/(4)-x) " cos " .((pi)/(4)-y) " - sin " ((pi)/(4)-x ) " sin " ((pi)/(4) -y) =" sin " (x+y)

If sin A+cos2A=1//2 and cos A+sin2A=1//3 . Then find the value of sin 3A .

If sin A+cos2A=1//2 and cos A+sin2A=1//3 . Then find the value of sin 3A .

If sin A+cos2A=1//2 and cos A+sin2A=1//3 . Then find the value of sin 3A .

(1 + sin2A-cos2A) / (1 + sin2A + cos2A) = tan A

(sin (n +1) A + 2 sin n A + sin (n-1) A)/( cos ( n -1) A - cos (n +1) A)=

Prove that sin (n + 1) theta sin (n - 1) theta + cos (n + 1) theta cos (n - 1) theta = cos 2 theta , n in ZZ .

sin (n + 1) A sin (n-1) A + cos (n + 1) A cos (n-1) A = cos2A