Exactly find sin(x+y) if sinx= 1/3 where x ends in the
2ndquadrant and cosy= 1/5 where y ends in the first quadrant.

Step-by-step explanation:

Since we have given that

Since x ends in the 2 nd quadrant,

So,

Similarly,

So, sin(x+y) is given by

Hence,

step-by-step explanation:

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents