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If alpha,beta,gamma are acute angles and...

If `alpha,beta,gamma` are acute angles and `costheta=sinbeta//sinalpha,cosvarphi=singamma//sinalpha and cos(theta-varphi) = sinbetasingamma` , then the value of `tan^2alpha-tan^2beta-tan^2gamma` is equal to (a)`-1` (b) `0` (c) `1` (d) 2

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