If vectors →a,→b and →c are such that |→a|=1,|→b|=2 and |→a−→b|2+|→a+2→b|2=20, then angle between vectors →a and →b is

If vectors →a,→b and →c are such that |→a|=1,|→b|=2 and |�

1.	If vectors →a,→b and →c are such that \|→a\|=1,\|→b\|=2 and \|→a−→b\|2+\|→a+2→b\|2=20, then angle between vectors →a and →b is
Answer» If vectors $\to a, \to b$ and $\to c$ are such that $\| \to a \| = 1, \| \to b \| = 2$ and $\| \to a - \to b \|^{2} + \| \to a + 2 \to b \|^{2} = 20,$ then angle between vectors $\to a$ and $\to b$ is

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If vectors →a,→b and →c are such that |→a|=1,|→b|=2 and |→a−→b|2+|→a+2→b|2=20, then angle between vectors →a and →b is

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