Trigonometric functions which are related by having the same value at complementary angles are called cofunctions. Cofunctions of complementary angles are equal.
A. csc 20' = csc(90-70)=sec 70
B. cos 87' = cos (90-3)=sin 3'
C. csc 40' = csc(90-50) =sec50'
D. tan 15' = tan(90-75)= cot 75'
Among all the option c is not correct.
Option C is false.
Answer:
Answer is C.
Step-by-step explanation:
It takes 1.7 x 10 ^4 for light from the sun to reach the comet.
<h3>How do scientific notations work?</h3>
The number is written in the form
where we have 
Scientific notations have some of the profits as:
Better readability due to compact representation
Its value in terms of the power of 10 is known, which helps in the easy comparison of quantities differing by a large value.
A comet is about
km from the sun.
Light travels at about
km per second.
= 
Hence, It takes 1.7 x 10 ^4 for light from the sun to reach the comet.
Learn more about scientific notation here:
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When the image of point C is reflected across the line, then it's written as C'.
1 ≤ 3 - x
x + 1 ≤ 3 <em>added x to both sides</em>
x ≤ 2 <em>subtracted 1 from both sides</em>
Number line: ←----------------------·2 (fill in the dot at 2 since it is "equal to")
Interval Notation: (-∞, 2]