Given that sina=5/13 and sinb=3/5 where a is acute and b is obtuse. find the value of 1. sin(a+b) 2. cosec(a+b) 3. cos(a+b) 4. tan(a+b)?

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Given that sina=5/13 and sinb=3/5 where a is acute and b is obtuse. find the value of 1. sin(a+b) 2. cosec(a+b) 3. cos(a+b) 4. tan(a+b)?

Science & Mathematics by Anonymous 2018-05-18 11:07:27

Social Science

Given that sina=5/13 and sinb=3/5 where a is acute and b is obtuse. find the value of 1. sin(a+b) 2. cosec(a+b) 3. cos(a+b) 4. tan(a+b)?

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i worked the question and got positive answers but my teacher said it has negative answers. plz help me....