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ARIHANT PUBLICATION BIHAR-TRIGONOMETRIC IDENTITIES-EXAM BOOSTER (FOR CRACKING EXAM)
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- cos^(4)theta-sin^(4)theta is :
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- sin ""(pi)/(4) cos ""(pi)/(12) - cos ""(pi)/(4) sin ""(pi)/(12) is eq...
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- The values of cos^(2) (theta - phi)/(2) - sin^(2) (theta + phi)/(2) is
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- cos^2 4 5^(@)-sin^2 1 5^(@)=
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