Question

please...................

Answer 1

sec theta..

hope will help. .thnx*

Answer 2

1-cos 2Ф/sin 2 Ф

⇒1-{cos^2Ф - sin^2Ф}/2 sinФ cosФ ||| cos 2Ф = cos^2Ф - sin^2Ф

⇒1-cos^2Ф + sin^2Ф/2 sinФ cosФ ||| sin 2Ф = 2 sinФ cosФ

⇒sin^2Ф+ sin^2Ф/2 sin Ф cosФ

⇒2 sin^2Ф/2 sinФ cosФ

⇒sin Ф/cos Ф ⇒tanФ

HOPE IT HELPS!!!

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