Evaluate :
sin² 34° + Sin ² 56° + tan 18° tan 72° - cot 2 30°.
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10th
Maths
Introduction to Trigonometry
Trigonometric Ratios of Complementary Angles
Without using trigonometric...
Maths
Without using trigonometric tables, evaluate sin
2
34
∘
+sin
2
56
∘
+2tan18
∘
tan72
∘
−cot
2
30
∘
Medium
Solution To Question ID 584269
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A
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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
∘
−(
3
)
2
=1+2tan18
∘
×
tan18
∘
1
−3
=1+2−3
=0
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