Madhyamik Trigonometry( Trigonometric Ratios and Identities ), Ganit Prakash Book Chapter-23.2 question no. 5.(ix)
Madhyamik Trigonometry, Trigonometric Ratios and Identities , Ganit Prakash Book Chapter-23.2 question no. 5.(ix), West Bengal Board Class 10 Trigonometry ,Wbbse Maths For Class 10
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