Question

Please answer step by step with attachment

Answer 1

Answer:

Step-by-step explanation:

We have to find he value of

→Cot 2 a - \frac{1}{Sin 2a}

→\frac{Cos 2a}{Sin 2a} - \frac{1}{Sin 2a}

You must keep in mind,

Cos 2 a = 2 Cos²a -1=1 -2 sin²a, Sin 2 a = 2 Sin a × Cos a

→\frac{Cos 2 a - 1}{Sin 2a}=\frac{-2 Cos^{2} a}{2 Sina\times Cosa}=\frac{-Cos a\times Cos a}{Sin a\times Cosa} = \frac{-Cos a}{Sina}= -Cot a  

→ So the value of , cot2a - \frac{1}{sin2a }= - Cot a

Answer 2

Answer:

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