Question

Find the value of 9 sac2 A_9 tan 2 A

Answer 1

What is this _sign mean

Answer 2

Here is your answer...
${9 \sec }^{2} a - 9 {tan}^{2} a \\ = 9( {sec}^{2} a - {tan}^{2} a) \\ = 9 \times 1 \\ = 9$
the value will be 9 【Answer】
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