1.

15. If m sin(0 + a) = n sin(0 + B) then show that cot 0 =mcosa - ncos Bnsin ß- msin ax sinoy sin esin Ꮎ1 - x cos othen show that1- y cosey sin otan o =16. If tan 0 =1.​

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I don't KNOW it is HARD...



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