Find the angle in radian through which a pendulum swings, if its length is 75cm and the tip describes an arc of length 21cm
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The value of tan75o=223+1.
Prove that: 2cos3A−cosAsinA−2sin3A=tanA.
Solve the following equation:sin6x+cos6x=167.
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(1−sin2θ )(1+tan2θ ) is equal to
Prove that :tan20o .tan40o .tan60o .tan80o=3