Question

Sec70 * sin20 - cos 70 * cosec 20

Answer 1

Answer:

hope it's your answer.....

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Answer 2

$Sec70 * sin20 - cos 70 * cosec 20 \\ = sec(90 - 20) \times sin20 - cos70 \times cosec(90 - 70) \\ = cosec20 \times sin20 - cos70 \times sec70 \\ = 1 - 1 \\ = 0$