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Prove that:cos420^@ sin390^@+ sin(-300^@...

Prove that:`cos420^@ sin390^@+ sin(-300^@)cos(-330^@)=1`

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Prove that: cos570^(@)s in510^(0)+sin(-330^(@))cos(-390^(@))=0

If cos theta=-(1)/(2) and piltthetalt(3pi)/(2) , then find the value of 4 tan^(2)theta-3cos ec^(2)theta . Prove that, cos 570^(@) sin510^(@)+sin(-330^(@))cos(-390^(@))=0

Prove that: sin420^(@)cos390^(@)+cos(-300^(@))sin(-330^(@))=1

Prove that: (a) cos510^(@) sin510^(@) + sin(-330^(@)) cos(-390^(@))=0 b) tan(11pi)/(3) -2sin(9pi)/3-3/4"cosec"^(2)pi/4 + 4cos^(2)(17pi)/6=(3-2sqrt(3))/2

Prove that: cos510^(0)cos330^(@)+s in390^(@)cos120^(@)=-1

What is the value of Sin420^@.cos390^@ + cos(-300^@). sin(-330^@ )?

cos510^(@)cos330^(@)+sin390^(@)cos120^(@)

Prove that cos120^@cos240^@-sin120^@sin240^@=1

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

Prove that: "sin"420^(@) cos390^(@)+cos(-660^(@))"sin"(-390^(@))=(1)/(2) .

MAHAVEER PUBLICATION-TRIGONOMETRIC RATIOS-QUESTION BANK
  1. Prove that (cos 8^(@) - sin 8^(@))/(cos 8^(@) + sin 8^(@)) = tan 3...

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  2. Prove that: cos 80^0+cos 40^0-cos 20^0=0

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  3. Prove that:cos420^@ sin390^@+ sin(-300^@)cos(-330^@)=1

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  4. Prove that: ("sin"(A-B))/(s in A s in B)+("sin"(B-C))/(s in B s in C)+...

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  5. Prove that: (sin(A+B)+"sin"(A-B))/(cos(A+B)+"cos"(A-B))=t a n A

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  6. (sinA+sin3A)/(cosA+cos3A)=tan2A

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  7. Prove that: (sinA+sinB)/(sinA-sinB) = tan(A+B)/(2). Cot(A-B)/(2)

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  8. Prove that (cosx +cosy)^2+(sinx+siny)^2=4cos^2((x-y)/2)

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  9. Solve for theta,(0^@ le theta le 360^@) 2sin^2theta+3 costheta=0

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  10. Solve for theta,(0^@ le theta le 360^@) cos theta +sqrt3 sin theta=0

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  11. Find the principal and general solutions of the equation sin x=sqrt3/2

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  12. Find the principal and general solutions of the equation tan x=-1/sqrt...

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  13. Find the principal and general solution of s e c x = 2

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  15. Find the principal and general solutions of the equationsqrt2 cos x=1

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  19. Find the principal and general solutions of the equation sec 4x- sec 2...

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