show that cos 2 (45 + theta) + cos 2 (45 - theta) / tan (60 + theta) tan (30 - theta) = 1

if tano+sino = m,tano -sino =n,prove that m^{2} -n^{2}=4root mn

How to make working model on trigonometry?

if cos theta + sin theta =root2 cos theta prove that cos theta - sin theta =root 2 sin theta

If a sin theta + b cos theta = c , then prove that a cos theta - b sin theta = the whole under root a^{2} + b^{2} - c^{2} .

plz answer soon if u want a thumbzzzz up guys !!!!!!!!!!!!!

if cos(alpha+beta)=0 then sin(alpha-beta)can be reduced to

options: a. cos2beta b.cosbeta c.sinalpha d.sin2alpha e.cos2alpha

if secA =x+ (1/4x), prove that secA + tanA =2x or 1/2x

rply fst!!!

if tan theta +sin theta=m, tan theta -sin theta=n show that m square -n square=4 root mn

prove that tan theta/1-cot theta +cot theta/1-tan theta=1+tan theta+cot theta

Plzz answer fast

ANSWER)

cos (3A) = cos(2A + A) = cos (2A) cos (A) - sin(2A) sin(A) = [ 2cos^2(A) - 1 ] cos (A) - (2 sin A cos A )sin A = 2cos^3(A) - cos A - 2sin^2(A) cos A = 2cos^3(A) - cos A - 2( 1 - cos^2(A)) cos A = 2cos^3(A) - cos A - 2cos A + 2cos^3(A) = 4cos^3(A) - 3cos A

If sec(theta)=x+1/4x, prove that sec(theta)+tan(theta)=2x or 1/2x

please answer my ques. Thanks in advance.

Prove that sin theta-cos theta+1/sin theta+cos theta-1 = 1/sec theta -tan theta.

if a+b=90. prove that root of tana.tanb + tana.cotb / sina .secb - root of sin^{2}b / cos^{2}a=tana

Prove that { Cos(90-Theta) / 1+sin(90-Theta) } + {1+sin(90-Theta) }/ (cos(90-Theta) } =2cosec Theta

find the value of sin30 geometrically

if sec theta+tan theta =p ,prove that sin theta = (p square- 1) / (p square + 1)

tanA + secA -1 / tanA - secA + 1=1+sinA / cosA

prove that

(1+cot theta + tan theta) (sin theta-cos theta) = sec theta /cosec square theta - cosec theta/sec square theta.

if A,B,c are interior angles of triangle ABC then show that sin (B+C/2) = cos A/2

A tower subtends an angle of 30 degree at a point on the same level as its foot. At a second point h metres above the first the angle of depression of the foot of the tower is 60 degree. The height of the tower is ?

show that cos 2 (45 + theta) + cos 2 (45 - theta) / tan (60 + theta) tan (30 - theta) = 1

if tan

~~o~~+sin~~o~~= m,tan~~o~~-sin~~o~~=n,prove that m^{2}-n^{2}=4root mnHow to make working model on trigonometry?

if cos theta + sin theta =root2 cos theta prove that cos theta - sin theta =root 2 sin theta

If a sin theta + b cos theta = c , then prove that a cos theta - b sin theta = the whole under root a

^{2}+ b^{2}- c^{2}.plz answer soon if u want a thumbzzzz up guys !!!!!!!!!!!!!

if cos(alpha+beta)=0 then sin(alpha-beta)can be reduced to

options: a. cos2beta b.cosbeta c.sinalpha d.sin2alpha e.cos2alpha

if secA =x+ (1/4x), prove that secA + tanA =2x or 1/2x

rply fst!!!

^{2}+bx+c =0, a≠0, then prove that relation between a,b,c is c=a+bif tan theta +sin theta=m, tan theta -sin theta=n show that m square -n square=4 root mn

prove that tan theta/1-cot theta +cot theta/1-tan theta=1+tan theta+cot theta

Plzz answer fast

## Prove that Cos3A = 4cos^3A - 3cosA ?

ANSWER)

cos (3A)

= cos(2A + A)

= cos (2A) cos (A) - sin(2A) sin(A)

= [ 2cos^2(A) - 1 ] cos (A) - (2 sin A cos A )sin A

= 2cos^3(A) - cos A - 2sin^2(A) cos A

= 2cos^3(A) - cos A - 2( 1 - cos^2(A)) cos A

= 2cos^3(A) - cos A - 2cos A + 2cos^3(A)

= 4cos^3(A) - 3cos A

If sec(theta)=x+1/4x, prove that sec(theta)+tan(theta)=2x or 1/2x

please answer my ques. Thanks in advance.

Prove that sin theta-cos theta+1/sin theta+cos theta-1 = 1/sec theta -tan theta.

^{2 }+1)^{2}-1)^{2}/(2n^{2}+1)^{2}+1^{}if a+b=90. prove that root of tana.tanb + tana.cotb / sina .secb - root of sin

^{2}b / cos^{2}a=tanaProve that { Cos(90-Theta) / 1+sin(90-Theta) } + {1+sin(90-Theta) }/ (cos(90-Theta) } =2cosec Theta

find the value of sin30 geometrically

^{2}theta - 3 cos theta + 2 / sin^{2}theta = 1if sec theta+tan theta =p ,prove that sin theta = (p square- 1) / (p square + 1)

tanA + secA -1 / tanA - secA + 1=1+sinA / cosA

prove that

(1+cot theta + tan theta) (sin theta-cos theta) = sec theta /cosec square theta - cosec theta/sec square theta.

if A,B,c are interior angles of triangle ABC then show that sin (B+C/2) = cos A/2

A tower subtends an angle of 30 degree at a point on the same level as its foot. At a second point h metres above the first the angle of depression of the foot of the tower is 60 degree. The height of the tower is ?