If \( f(x)=\left(\sin ^{-1} x\right)^{2}+\left(\cos ^{-1} x\right)^{2} \), then:
(a) \( f(x) \) ... VIDEO
If \( f(x)=\left(\sin ^{-1} x\right)^{2}+\left(\cos ^{-1} x\right)^{2} \), then:
(a) \( f(x) \) has the least value of \( \frac{\pi^{2}}{8} \)
(b) \( f(x) \) has the greatest value of \( \frac{5 \pi^{2}}{8} \)
(c) \( f(x) \) has the least value of \( \frac{\pi^{2}}{16} \)
(d) \( f(x) \) has the greatest value of \( \frac{5 \pi^{2}}{4} \)
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