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If costheta1 =2costheta2, then tan((the...

If `costheta_1 =2costheta_2,` then `tan((theta_1-theta_2)/2)tan((theta_1+theta_2)/2)` is equal to (a)`1/3` (b) `-1/3` (c)`1` (d) `-1`

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
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