solve cot²30 without using trigonometrical ratios
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solve cot²30 without using trigonometrical ratios
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Step-by-step explanation:
Given:
sin
2
34
∘
+sin
2
56
∘
+2tan18
∘
tan72
∘
−cot
2
30
∘
=sin
2
34
∘
+sin
2
(90
∘
−34
∘
)+2tan18
∘
tan(90
∘
−18
∘
)−cot
2
30
∘
=sin
2
34
∘
+cos
2
34
∘
+2tan18
∘
cot18
∘
l
−(
3
)
2
=1+2tan18
∘
×
tan18
∘
1
−3
=1+2−3
=0
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Step-by-step explanation:
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