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cos^4A-sin^4A is equal to 2cos^2A+1 (...

`cos^4A-sin^4A` is equal to `2cos^2A+1` (b) `2cos^2A-1` (c) `2sin^2A-1` (d) `2sin^2A+1`

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RD SHARMA-TRIGONOMETRIC IDENTITIES-All Questions
  1. The value of sqrt((1+costheta)/(1-costheta)) is (a)cottheta-cos e...

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  2. sec^4 A− sec^ 2 A is equal to (a)tan 2 A− tan ...

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  3. cos^4A-sin^4A is equal to 2cos^2A+1 (b) 2cos^2A-1 (c) 2sin^2A-1 ...

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  4. (sintheta)/(1+costheta) is equal to (1+costheta)/(sintheta) (b) (1-...

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  5. (sintheta)/(1-cottheta)+(costheta)/(1-tantheta) is equal to (a) 0 (b) ...

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  6. The value of (1+cottheta-cos e c\ theta)(1+tantheta+sectheta) is (a...

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  7. (tantheta)/(sectheta-1)+(tantheta)/(sectheta+1) is equal to 2tanthet...

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  8. (cos e c\ theta-sintheta)(sectheta-costheta)(tantheta+cottheta) is equ...

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  9. If x=acostheta and y=bsintheta , then b^2x^2+a^2y^2= (a)a^2b^2 (b) a ...

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  10. If x=asectheta and y=btantheta , then b^2x^2-a^2y^2= (a)a b (b) ...

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  11. (cottheta)/(cottheta-cot3theta) + tantheta/(tantheta-tan3theta) is equ...

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  12. 2(sin^6theta+cos^6theta)-3(sin^4theta+cos^4theta) is equal to (a)0 (...

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  13. If acostheta+bsintheta=4 and asintheta-bcostheta=3 , then a^2+b^2 = (a...

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  14. If acottheta+b"c o s e c"theta=p and bcottheta+a"c o s e c"theta=q , t...

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  15. The value of sin^2 29o+sin^2 61o is (a) 1 (b) 0 (c) 2sin^2 29o (d) ...

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  16. If x=rsinthetacosvarphi , y=rsinthetasinvarphi and z=rcostheta , then ...

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  17. If sintheta+sin^2theta=1 , then cos^2theta+cos^4theta= (a)-1 (b) 1 (c...

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  18. If acostheta+bsintheta=m and asintheta-bcostheta=n , then a^2+b^2= (a...

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  19. If cosA+cos^2A=1 , then sin^2A+sin^4A= (a)-1 (b) 0 (c) 1 (d) None of ...

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  20. If x=asecthetacosvarphi , y=bsecthetasinvarphi and z=ctantheta , then ...

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