evaluate sec 37° × cosec 53° - tan 37° × cot 53°
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= Sec 37° . Cosec 53° - tan 37° . cot 53°
= sec 37° . cosec(90°-37°) - tan 37° . cot (90° - 37°)
= sec 37° . sec 37° - tan 37° . tan 37°
= sec² 37° - tan² 37°
= 1 ( sec²Ø - tan²Ø = 1)
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