A number multiplied by 4 is -20
2 answers:
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Answer:
=
+
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;
=
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
=
But 1- cos²x = sin²x
Hence we will replace 1- cos²x by sin²x
=
=
=
= +
= +
= +
=
+
Note that;
=
=
