RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS-All Questions
- Verify that: (i) cos60^@=cos^2 30^@-sin^2 30^@=1/2
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- If theta is an acute angle and sintheta=costheta , find the valu...
02:16
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- Given that sin(A+B)=sinAcosB+cosAsinB , find the value of sin75^@ .
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- In a rectangle A B C D ,\ \ A B=20 c m , /B A C=60^@ . Calculate s...
01:37
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- Evaluate the following: (i) sin45osin30o+cos45ocos30o (ii) sin60oc...
03:24
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- Evaluate the following: (i) cos60ocos45o-sin60osin45o (ii) sin^2 3...
04:12
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- Evaluate the following: cos^2 30o+cos^2 45o+cos^2 60o+cos^2 90o (...
03:33
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- Evaluate the following: (i) 2sin^2 30o-3cos^2 45o+tan^2 60o (ii) s...
05:29
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- Evaluate the following: 4(sin^4 60o+cos^4 30o)-3(tan^2 60o-tan^2 4...
06:02
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- Evaluate the following: cos e c^3 30ocos60otan^3 45osin^2 90osec^2 ...
04:26
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- Evaluate the following: (cos0o+sin45o+sin30o)(sin90o-cos45o+cos60o)...
05:16
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- Evaluate the following: (i) 4/(cot^2 30o)+1/(sin^2 60o)-cos^2 45o ...
10:25
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- Evaluate the following: (tan^2 60o+4cos^2 45o+3sec^2 30o+5cos^2 90o)...
03:34
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- Evaluate the following: (tan45^@)/(cos e c\ 30^@)+(sec60^@)/(cot45^@...
01:50
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- Find the value of x in each of the following: (i) 2sin3x=sqrt(3) (...
03:01
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- Find the value of x in each of the following: tanx=sin45°cos45°+si...
04:25
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- If theta=30^@ , verify that: (i) tan2theta=(2tantheta)/(1-tan^2theta...
05:20
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- If theta=30^@ , verify that: (i) cos2theta=(1-tan^2theta)/(1+tan^2th...
04:47
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- If A=B=60^@ , verify that (i) cos(A-B)=cosAcosB+sinAsinB (ii) sin(A...
05:53
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- If A=30^@ and B=60^@ , verify that (i) sin(A+B)=sinAcosB+cosAsinB (...
03:54
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