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Find the values of the following trigono...

Find the values of the following trigonometric ratios. (1) `cos e c390^0` (ii) `cot570^0` (iii) `t a n480^0` (iv) `cos270^0` (v) `t a n(19pi)/3` (vi) `s in((-11pi)/3)` (vii) `cot(-15pi)/4`

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RD SHARMA ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
  1. If x=(2sintheta)/(1+costheta+sintheta) , then prove that (1-costheta+...

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  2. If tanx=(b)/(a), then find the value of sqrt((a+b)/( a-b ))+sqrt((a-b)...

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  3. Find the values of the following trigonometric ratios. (1) cos e c390^...

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  4. Prove that: sin(-420^0)(cos390^0)+cos(-660^0)(sin330^0)=-1.

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  5. Prove that: "sec"((3pi)/2-theta)"sec"(theta-(5pi)/2)+t a n((5pi)/2+the...

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  6. Prove that: sin^2pi/(18)+sin^2pi/9+sin^2(7pi)/(18)+sin^2(4pi)/9=2

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  7. If any quadrilateral ABCD, prove that "sin"(A+B)+sin(C+D)=0 "cos"(A...

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  8. Find the value of the expression 3{sin^4((3pi)/2-theta)+sin^4(3pi+the...

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  9. If t a n^2theta=1-a^2 , prove that sectheta+t a n^3thetacos e ctheta=(...

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  10. If acos^3theta+3acosthetasin^2theta=m and asin^3theta+3acos^2thetasin...

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  11. If 2t a n^2alphat a n^2betat a n^2gamma+t a n^2alphat a n^2beta+t a ...

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  12. If m^2 + m'^2 + 2mm' costheta = 1 and n^2+n'^2+2n n'costheta=1, (mn +...

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  13. If (sin^4theta)/a+(cos^4theta)/b=1/(a+b) , prove that (sin^8theta)/(a...

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  14. If (cos^4alpha)/(cos^2beta)+(sin^4alpha)/(sin^2beta)=1 prove that (i...

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  15. If x is any non-zero real number, show that costheta' a n d ' sinthet...

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  16. If A=cos^2theta+sin^4theta, prove that 3/4lt=Alt=1 for all values of...

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  17. If tantheta+sectheta=e^x then costheta equals

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  18. Prove that:sqrt((1+costheta)/(1-costheta))=cos e ctheta+cottheta .

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  19. Prove the following identities: sin^8theta-cos^8theta=(sin^2theta-cos^...

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  20. Prove the following identities: cot^4theta+cot^2theta=cos e c^4theta-"...

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