[" Q2prove that - "],[" (i) "sin38^(@)+sin22^(@)=sin82^(@)]

Prove that sin38^@+sin22^@=sin82^@ .

(2sin38^(@))/(cos52^(@))

Prove that: sin38^(@)+s in22^(0)=s in82^(0)

If A+B+C= 180^(@) , prove that: (i) "sin"^(2)+"sin"^(2)B-"sin"^(2)C=2 "sin"A sin B cos C (ii) "sin"^(2)A-"sin"^(2)B+"sin"^(2) C=2 sin Acos B sin C.

If (cos^(4)A)/(cos^(2)B)+(sin^(4)A)/(sin^(2)B)=1 then prove that (i)sin^(2)A+sin^(2)B=2sin^(2)A sin^(2)B(ii)(cos^(4)B)/(cos^(2)A)+(sin^(4)B)/(sin^(2)A)=1

sin^(2)22^(@)+sin^(2)38^(@)+sin22^(@) sin38^(@)=

The value of sin (sin ^ (2) (- 212 ^ (@)) cos302 ^ (@) + cos ^ (3) (- 148 ^ (@))) / (sin (-82 ^ (@)) cos (-8 ^ (@)) + sin368 ^ (@) sin (-172 ^ (@)) - sin58 ^ (@) sin148 ^ (@))

Prove that: sin^(2)12^(@)+sin^(2)21^(@)+sin^(2)39^(@)+sin^(2)48^(@)=1+sin^(2)9^(@)+sin^(2)18^(@)

Prove that sin^(2)5^(@) +sin^(2)10^(@) + sin^(2)15^(@)+...+sin^(2)90^(@)=(19)/(2)

Prove that: i) sin50^(@)-sin70^(@)+sin10^(@)=0 ii) sin(60^(@)+A)+sin(60^(@)-A) = sqrt(3)cosA