a. (cos^2 25°+cos^2 65°) + cosec theta sec (90°-theta)-cot theta tan (90-theta).
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Answer:
cos²25 + cos²65 + cosec@sec(90-@) - cot@tan(90-@)
=> cos²25 + cos²(90-25) + cosec@*cosec@ - cot@ * cot@
=>(cos²25 + sin²25) + (cosec²@ - cot²@)
=> (1) + (1)
=> 2
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