Question

9.
li x = y cos a sin B; y = y cos a cos ß and z= y sin a, show that x2 + y2 + z2 = 72.
Prove that: (sin 0 + 1 + cos O) (sin 0 - 1 + cos ().sec 0 cosec 0 = 2
If sec 0 = x + 1, x 0, find (seco + tan 6).
10.​

Answer 1

Answer:

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