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If P(n) = cos ^(n)theta + sin^(n)theta t...

If `P_(n) = cos ^(n)theta + sin^(n)theta` then `2. P_(6) - 3. P_(4) + 1 = `

A

2

B

3

C

1

D

0

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The correct Answer is:
D
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MODERN PUBLICATION-TRIGONOMETRIC RATIOS, IDENTITIES AND EQUATIONS-MULTIPLE CHOICE QUESTION(LEVEL-II)
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  17. If (sec A + tan A) (sec B + tan B) (sec C + tan C) = (sec A-tan A) (se...

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  18. If a=1/(5cosx+12sinx) then for all real x.

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  19. If A + B =pi/3 and cosA + cosB = 1, then :

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  20. If Agt=0,B=0,A + B = pi/3 and y = tanA.tanB, then :

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