Prove that : `(sin^(4)theta- cos^(4) theta+ 1) 'cosec'^(2)theta=2`

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Prove that : `(sin^(4)theta- cos^(4) theta+ 1) "cosec"^(2)theta=2`
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To all those good advisors here who are telling how to pronounce things right ...keep in mind you are still not able to do what she did....and taking help from her only .

kavitapant
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at 1:17 why you don't put the value of sin^2theta + cos^2theta?

ananyasingh
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Scare nhi square hota h padhana to Sikh lo didi

sisterscreativeworld