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निम्नलिखित के मान ज्ञात कीजिए । (i)...

निम्नलिखित के मान ज्ञात कीजिए ।
(i) ` cos 135^(@)` (ii) ` sin ( -780^(@))`
(iii) ` tan 240^(@)` (iv) ` ""cosec" "1920^(@)`

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