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If x = $a sec\theta cos\phi$ , y = $b sec\theta sin\phi$, z = $c tan\theta$, then the value $\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}-\frac{z^{2}}{c^{2}}$ is :1). 12). 43). 94). 0 |
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