Ex 3.3, 8 - Prove cos (pi x) ... - Chapter 3 Class 11 Trigonometry
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Ex 3.3, 8 - Prove cos (pi x) ... - Chapter 3 Class 11 Trigonometry
Ex 3.3, 8Prove that cos⁡〖 (π 𝑥) cos⁡〖(− 𝑥)〗 〗/(sin⁡〖 (π − 𝑥)〗 cos⁡〖"(" π/2 " " 𝑥")" 〗 ) = cot2 𝑥Solving L.H.S. 𝒄𝒐𝒔⁡〖(𝝅 𝒙) 〖𝒄𝒐𝒔 〗⁡〖(−𝒙)〗 〗/(𝒔𝒊𝒏⁡(𝝅 − 𝒙) 𝒄𝒐𝒔⁡〖"(" 𝝅/𝟐 " " 𝒙")" 〗 ) Putting π = 180° = 𝑐𝑜𝑠 ...
Dec 13, 2024
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