Question

prove that the above equation is true​

Answer 1

Answer:

It is true.. Put the values to get the answer.

Answer 2

Step-by-step explanation:

1/(2sin10)-2sin70

=1/(2sin10)-2sin(90-20)

=1/(2sin10)-2cos20

={1-4cos20.sin10}/sin10

=1/(2sin10){1-2.(2cos20.sin10)}

=1/(2sin10)[1-2{sin(20+10)-sin(20-10)}]

=1/(2sin10)[1-2{sin30-sin10}]

=1/(2sin10)[1-2{1/2-sin10}]

=1/(2sin10)[1-1+2sin10]

=1/(2sin10).[2sin10]

=1

hope it helps ☺

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