#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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