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If A,B,C are positive acute angles and `tan A=4/7`and tan B=1/7,tan C=1/8 prove that `A+B+C=45^@`

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UNITED BOOK HOUSE-KALIDHAN INSTITUTION-EXERCISE
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  2. Prove that,sqrt((sectheta-1)/(sectheta+1))=cosectheta-cottheta

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  4. Find the value of 1/2sec80^@-2cos20^@

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  12. Do you think 4 as a complex number?if so why ?

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  20. If the term independetn of x in the expansion of (k/3x^2-3/(2x))^9be 2...

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