Here is some thoughts on this:
cos 57 = sin (90-57) = sin 33
so cos 57 . cosec 33 = cos 57 / sin 33 = sin 33 / sin33 = 1
2 cos 60 = 2 * 1/2 = 1
so the last 2 parts work out to 0
now we have to find cos 70 / sin 20
sin 20 = cos 70 so this comes to 1
so finally the answer is 1
86921 = 80000 + 6000 + 900 +20 +1
Answer:
abcyou
Step-by-step explanation:
The equivalent expression of 
is 
<h3>How to determine the equivalent expression?</h3>
The expression is given as:
Expand the numerator
Divide 125 and 30 by 5
Apply the law of indices
Evaluate the exponent
Hence, the equivalent expression of is
Read more about equivalent expression at:
brainly.com/question/2972832
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