Which function is negative for the interval (–1, 1]?
2 answers:
⇒The Interval in which we have to find the function is Negative is (-1,1].
→(-1,1]=Semi closed or Semi Open Interval, Point -1, is not included in the set, but 1 is included in the set.
⇒ The meaning of negative here is,that either for positive or negative value of x , the value of f(x), that is y Should be negative.
⇒y is negative in third and fourth Quadrant.
Graph -(2), is the function , in which the function is negative for the interval (–1, 1].
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Answer:
2sin50 cos20
Step-by-step explanation:
We need to write sin (70) + sin(30) as a product. The formula used here is :
Here, A = 70 and B = 30
So,
So, the value of sin (70) + sin(30) is 2sin50 cos20. Hence, the correct option is (c).