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`        if X and Y are the differnent roots of the equation acosA+ bsinA=c then cos[X+Y]=....`
2 years ago

29 Points
```										AS  X and Y are the differnent roots of the equation acosA+ bsinA=c a cos A = c- bsin A squaring both sidesa2 ( cos A )2 = c2 + b2sin2Acos2A = i – sin2A(a2+b2) sin2A – 2acsin A + c2-b2 = 0sinXsinY= c2-b2 / a2+b2                                                     similarly solve for cosX cos Y = c2-a2 / a2+b2 cos (X+Y) = cos X cos Y – sin X sin YPUT VALUES and you’ll get answer
```
2 years ago
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