October 2018 2 397 Report
Buktikan identitas berikut

1) 1 - cot kuadrat A
________________ = 1 - 2cos kuadrat A
1 + cot kuadrat A

2) cos A
__________ - tan A = sec A
1 - sin A

3) ( 1 + sec A ) ( csc A - cot A ) = tan A


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