Q.
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a
Because T=2πL/g is based on the assumption that cosθ≡θ which is true only for small amplitude.
b
Because T=2πL/g is based on the assumption that secθ≡θ which is true only for small amplitude.
c
Because T=2πL/g is based on the assumption that sin θ≡θ which is true only for small amplitude.
d
Because T=2πL/g is based on the assumption that tan θ≡θ which is true only for small amplitude.
answer is C.
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