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

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

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

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

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Prove that: (cos40^(@)+cos50^(@))/(sin40^(@)+sin50^(@))=1

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If tantheta=(cos25^(@)+sin25^(@))/(cos25^(@)-sin25^(@))andtheta is in the third quadrant, then theta =