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Find the value of cos^2 30^@-2cos^2 60^@...

Find the value of `cos^2 30^@-2cos^2 60^@-4sin^2 45^@+tan45^@`.

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Find the value of cot^2 30^@-2cos^2 60^@- 3/4 sec^2 45^@-4sin^2 30^@ .

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Find the value of sin^(3)60^(@) cot 30^(@)-2 sec^(2) 45^(@)+3 cos60^(@) tan45^(@)-tan^(2)60^(@) .

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UNITED BOOK HOUSE-JHOWDANGA SAMMILANI HIGH SCHOOL-EXERCISE
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  12. Find the value of cos^2 30^@-2cos^2 60^@-4sin^2 45^@+tan45^@.

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