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The Brainliest Answer!
2015-03-08T19:36:31+05:30
Let theta = Ф
7cos²Ф + 3sin²Ф = 4
4cos²Ф + 3(cos²Ф+sin²Ф) = 4                 (cos²Ф+sin²Ф = 1)
4cos²Ф + 3 = 4
4cos²Ф = 1
cos²Ф = 1/4
sec²Ф = 4
secФ = 2 or -2
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