Question

3. Prove that cos O cos 0/2 -cos 30 cos 90/2 =sin 40 sin 78/2
(4)
(ii) If Y= {1,2,3,---, 10), and a represents any element of Y, write the following set,
containing all the elements satisfying the given condition as Y but a Y
indy hoth lis in the second quadrant , find the values of​

Answer 1

Answer:

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