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Question

If cos θ=12 and<θ < 360,then the solutions are



A

θ=60,240

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B

θ=120,240

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C

θ=120,210

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D

θ=120,300

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Solution

The correct option is B

θ=120,240


Given equation:cosθ=12cosθ=cos 120θ=120                         Orcosθ=cos240θ=240So both 120 and 240 lie in 0<θ <360


Mathematics
RD Sharma
Standard XI

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