Math, asked by KASHISH192006, 3 months ago

1 by Cos A + sin a + 1 by Cos A minus Sin A is equals to 2 cos A by 2 cos square A minus one

Answers

Answered by sandy1816

3

Answer:

1/cosa+sina + 1/cosa-sina

=cosa-sina+cosa+sina/cos²a-sin²a

=2cosa/cos²a-1+cos²a

=2cosa/2cos²a-1

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