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Find the values of the following: `t a n 15^0` ii. `t a n 75^0`

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The value of `tan15^o + tan75^o` is
=`[(sqrt(3)-1)/(sqrt(3 )​+1)​]+[(sqrt(3 )​+1)/(sqrt(3) ​-1)]`
since `tan 15^o is [(sqrt(3)-1)/(sqrt(3 )​+1)​] ` and `tan 75^ =[(sqrt(3 )​+1)/(sqrt(3) ...
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RD SHARMA-TRIGONOMETRIC RATIOS OF COMPOUND ANGLES-Solved Examples And Exercises
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  4. Find the values of the following: tan(13pi)/(12)

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  5. Evaluate the following: sin(7pi)/(12)cospi/4-cos(7pi)/(12)sinpi/4

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  6. Evaluate the following: cos(2pi)/3cospi/4-sin(2pi)/3sinpi/4

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  7. Prove that: cos(pi/4-A)cos(pi/4-B)-sin(pi/4-A)sin(pi/4-B)="sin"(A+B)

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  8. Prove that: sin(n+1)A sin(n+2)A+cos(n+1)A cos(n+2)A=cos A

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  10. Prove that: cos((3pi)/4+x)-cos((3pi)/4-x\ )=sqrt(2)sinx

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  11. Prove that: sin(x+y)/sin(x-y)=(tanx+tany)/(tanx-tany)

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  12. Prove that (tan(pi/4+x))/(tan(pi/4-x))=((1+t a n x)/(1-t a n x))^2

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  13. if tanalpha=1/(sqrt(x(x^2+x+1))), tanbeta=(sqrtx)/(sqrt(x^2+x+1) and ...

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  17. Prove that: (cos^2 33^@-cos^2 57^)/(sin(21)^@-cos(21))=-1/sqrt(2)

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