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An Intiative by Sri Chaitanya
a
cos2ϕ=cos2ϕ1+cos2ϕ2
b
sec2ϕ=sec2ϕ1+sec2ϕ2
c
tan2ϕ=tan2ϕ1+tan2ϕ2
d
cot2ϕ=cot2ϕ1+cot2ϕ2
answer is D.
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