Sec(90°-ø).cosec ø-tan (90°-ø)cotø+cos2 25°+cos2 65°
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3tan 27°tan 63°
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Step-by-step explanation:
sec(90-©)=cosec©
tan(90-©)=cot©
cos²25=sin²(90-25)=sin²65
tan 27= cot(90-27)=cot 63
cosec©.cosec ©- cot©.cot©+sin²65+cos²65/3.cot63.tan63
cosec²©- cot²©+1/3*1 (sin²©+cos²©=1)
1+1/3 (cosec²©- cot²©=1)
2/3.
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