12. The cost of a scooter is 5685 more than the cost of a T.V. If the cost of the TV is 22643, find the total cost of scooter an
1 answer:
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via the angle sum formula of sin
which proves the second choice
the third choice is wrong since for x=0,y=0 it will show that 2=1 which is incorrect
for the fourth one you can do some thing similar to choice one just expand the sum formula of sin and that should be true too
so
the first , the second and the fourth are all true