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Prove tha sin 25^0 cos 115^0 = 1/2 (sin ...

Prove tha `sin 25^0 cos 115^0 = 1/2 (sin 40^0 -1)`

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Prove tha sin 25^0 cos 115^0 = 1/2 (sin 140^0 -1)

Prove tha sin25^(0)cos115^(0)=(1)/(2)(sin40^(@)-1)

Prove that cos65^0+cos115^0=0

Prove that cos65^0+cos115^0=0

Prove that cos65^0+cos115^0=0

sin25^@cos115^@=1/2(sin40^@-1)

sin25^@cos115^@=1/2(sin40^@-1)

sin25^@cos115^@=1/2(sin40^@-1)

sin25^(@)cos115^(@)=(1)/(2)(sin40^(@)-1)

Prove that cos65^(@)+cos115^(0)=0