Question #6c946

1 Answer
salamat
Jul 18, 2017

#theta = npi#, #n = 0, 1, 2, 3, ...#

Explanation:

#cos theta = csc theta -: cot theta#

#cos theta= 1/sin theta -: cos theta/sin theta#

# cos theta = 1/cancel(sin theta) * cancel(sin theta)/cos theta#

# cos^2 theta = 1#

# cos theta = +-1#

#theta = 0^@, 180^@, 360^@,...# or

#theta = npi#, #n = 0, 1, 2, 3, ...#

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