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(i) Evaluate : sec (cos^(-1).(1)/(2)) ...

(i) Evaluate : `sec (cos^(-1).(1)/(2))`
(ii) slove the equations ` sin^(-1) x + sin^(-1) y = (2pi)/(3)` and ` cos^(-1) x - cos ^(-1) y = (pi)/(3)`

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The correct Answer is:
(i) 2 (ii) `x = (1)/(2),y=1`
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NAGEEN PRAKASHAN-INVERES TRIGONOMETRIC FUNCTIONS-Exericse 2a
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  10. Prove that : cot^(-1) 3 + cot^(-1).(3)/(4) = cot^(-1) .(1)/(3)

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  14. Prove that : cos ^(-1) ((1- a^(2))/(1+a)) + cos ^(-1)((1-b^(2))/(1+b...

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