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If sin(alpha+beta)sin(alpha-beta)=singam...

If `sin(alpha+beta)sin(alpha-beta)=singamma(2sinbeta+singamma),` where `0 < alpha,beta,gamma < pi,` then the straight line whose equation is `xsinalpha+ysinbeta-singamma=0` passes through point (a) `(1,1)` (b) `(-1,1)` (c) `(1,-1)` (d) none of these

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CENGAGE PUBLICATION-STRAIGHT LINES-All Questions
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