tan5 tan25 tan30 tan65 tan85=?
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tan 5° tan 85° tan 25° tan 65° tan 30°
tan(90°-85°) tan 85° tan(90°-65°) tan 65°×1/√3
= cot 85° tan 85° cot 65° tan 65° tan 30°
= 1 × 1/√3 = 1/√3
tan(90°-85°) tan 85° tan(90°-65°) tan 65°×1/√3
= cot 85° tan 85° cot 65° tan 65° tan 30°
= 1 × 1/√3 = 1/√3
danish07863:
kya btau
nhi dena hai mt do. okkkk
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