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1)tan7°×tan83°×tan67°×tan23°×tan660°
tan7°×cot7°×tan67°×cot67°×√3
=√3
2) cos80°/sin10°+cos59°×sec59°
=1+1=2
3) cosec20°sin20°-cos20°sec20°
=1-1
=0
4) (sin65°+cos25) (sin65°-cos65°)
(sin^2 65°-cos^2 25°)
(sin^2 65-sin^ 65°) =0
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