Question

# $1-{\mathrm{cos}}^{2}A$ is equal to ?

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Solution

## We know that, ${\mathrm{sin}}^{2}A+{\mathrm{cos}}^{2}A=1$⇒ $1-{\mathrm{cos}}^{2}A={\mathrm{sin}}^{2}A$Therefore, $1-{\mathrm{cos}}^{2}A$ is equals to ${\mathrm{sin}}^{2}A$

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