y = sec^2theta + cos^2theta, theta != 0, then?(Solve it without A.M - G.M inequality method)
A: y = 0
B: y <= 2
C: y >= -2
D: y > 2
The answer is (D) for your reference
A: y
B: y
C: y
D: y
The answer is (D) for your reference
1 Answer
Aug 2, 2017
Explanation:
=sec^2theta-2secthetacostheta+cos^2theta+2
=(sectheta-costheta)^2+2
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as
i.e.