find the value of 3sin2 20degree- 2tan2 45degree+3 sin2 70degree
Answers
Answered by
11
hi dude
Answer:
Step-by-step explanation:
3sin²20°-2tan²45°+3sin²70°
=3sin²20°-2×(tan45°)²+3{sin(90°×1)-20°}²
=3sin²20°-2×(1)²+3cos²20°
=3(sin²20°+cos²20°)-2
=3-2 [∵, sin²20°+cos²20°=1]
=1 Ans.
hope it helps u!!!
Answered by
8
3sin²20°-2tan²45°+3sin²70°
=3sin²20°-2×(tan45°)²+3{sin(90°×1)-20°}²
=3sin²20°-2×(1)²+3cos²20°
=3(sin²20°+cos²20°)-2
=3-2 [∵, sin²20°+cos²20°=1]
=1 Ans.
=3sin²20°-2×(tan45°)²+3{sin(90°×1)-20°}²
=3sin²20°-2×(1)²+3cos²20°
=3(sin²20°+cos²20°)-2
=3-2 [∵, sin²20°+cos²20°=1]
=1 Ans.
nethrandevi:
its wrong
no
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