Trigonometric Identities and Values

The value of $cos^2 10^o 15^o + cos^2 20^o +...... + cos^2 365^O$

$16 \cos^6 10^o - 24 \cos^4 10^o + 9 \cos^2 10^o$ is equal to

If $(1+\tan 1^{o})(1+\tan 2^{o})(1+\tan 3^{o})....(1+\tan 45^{o})=2^{n}$, then $n$ is equal to 

Values of : $sin{ 10 }^{ 0 }sin{ 50 }^{ 0 }sin{ 60 }^{ 0 }sin{ 70 }^{ 0 }$ is

$sin^21^0+sin^22^0+sin^23^0+....+sin^290^0$

The value of $(4 \, cos^2 9^o - 1) (4 cos^2 27^o - 1) (4 \, cos^2 81^o - 1) (4 \, cos^2 243^o - 1) $ is 

$sin{ 40 }^{ \circ  }{ 35 }^{ | }cos{ 19 }^{ \circ  }{ 25 }^{ | }+cos{ 40 }^{ \circ  }{ 35 }^{ | }sin{ 19 }^{ \circ  }{ 25 }^{ |= }$

$\sqrt {3}\csc 20^{o}-\sec 20^{o}$ is equal to

Find the value of, $\dfrac {4}{3}\cot^{2}30^{o}+\cot^{2}60^{o}-2\csc ^{2}60^{o}-\dfrac {3}{4}\tan^{2}30^{o}$

$ \sqrt { 3 } \ cosec 20 ^ { \circ } - \sec 20 ^ { \circ }$  is equal to :

$Tan \,25^o.Tan \,31^o + Tan \,31^o.Tan \,34^o  + Tan \,34^o .Tan \,25^o =$

$(1+\tan 5^{o})(1+\tan 10^{o})(1+\tan 15^{o}).....(1+\tan 45^{o})$ is equal to

$sin 12^o\sin\ 24^o\sin\ 48^o\sin\ 84^o$=