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Prove: \[\mathbf{co}{{\mathbf{t}}^{\mathbf{2}}}~\mathbf{A}\text{ }-\text{ }\mathbf{co}{{\mathbf{s}}^{\mathbf{2}}}~\mathbf{A}\text{ }=\text{ }\mathbf{co}{{\mathbf{s}}^{\mathbf{2}}}\mathbf{A}.\text{ }\mathbf{co}{{\mathbf{t}}^{\mathbf{2}}}\mathbf{A}\]
Prove: \[\mathbf{co}{{\mathbf{t}}^{\mathbf{2}}}~\mathbf{A}\text{ }-\text{ }\mathbf{co}{{\mathbf{s}}^{\mathbf{2}}}~\mathbf{A}\text{ }=\text{ }\mathbf{co}{{\mathbf{s}}^{\mathbf{2}}}\mathbf{A}.\text{ }\mathbf{co}{{\mathbf{t}}^{\mathbf{2}}}\mathbf{A}\]
Class 10 | Exercise 21A | ICSE | Selina | Trigonometrical Identities
Prove: \[\mathbf{co}{{\mathbf{t}}^{\mathbf{2}}}~\mathbf{A}\text{ }-\text{ }\mathbf{co}{{\mathbf{s}}^{\mathbf{2}}}~\mathbf{A}\text{ }=\text{ }\mathbf{co}{{\mathbf{s}}^{\mathbf{2}}}\mathbf{A}.\text{ }\mathbf{co}{{\mathbf{t}}^{\mathbf{2}}}\mathbf{A}\]

cot2 A – cos2 A

Selina Solutions Concise Class 10 Maths Chapter 21 ex. 21(A) - 10

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