Ellen says that 1 2/5 equal 5/7. Is she correct? Explain.
2 answers:
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Answer:
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Step-by-step explanation:
To verify the identity:
sinx/1-cosx = cscx + cotx
we will follow the steps below;
We will take just the left-hand side and work it out to see if it is equal to the right-hand side
sinx/1-cosx
Multiply the numerator and denominator by 1 + cosx
That is;
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open the parenthesis on the right-hand side of the equation at the numerator and the denominator
sinx(1+cosx) = sinx + sinx cosx
(1-cosx)(1+cosx) = 1 - cos²x
Hence
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But 1- cos²x = sin²x
Hence we will replace 1- cos²x by sin²x
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Note that;
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