Evaluate
sec25 cosec65 - tan25 cot65
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Step-by-step explanation:
sec25 cosec65 - tan25 cot65
= sin 25° cos(90-25)+ cos25° sin(90-25)
= si 25° sin25° + cos25° cos25°
= sin^2 25° + cos^2 25°
= 1
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