If x = a cosec 0, y = b cot , then 1) x2 + y2 = a+ b2 2) + a y? 62 =1 3 p² II b2 4) x2 - y2 = a - b?
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ছঠথডদখঢ়খদটরঠৎঠথঠরথ738354
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