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निम्नलिखित असमिकाओं की ज्यामिति या किसी ...

निम्नलिखित असमिकाओं की ज्यामिति या किसी अन्य विधि द्वारा स्थापना कीजिए :
(a) `|vecA + vecB| le |vecA| + |vecB|`
(b) `|vecA + vecB |ge ||vecA| - |vecB||`
(c ) `|vecA - vecB| le |vecA| + |vecB|`
`|vecA - vecB| le |vecA| + |vecB|`
`|vecA - vecB| ge ||vecA| - |vecB||`
इनमे समिका (समता) का चिन्ह कब लागू होता है ?

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