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RD Chapter 5 Trigonometric Ratios Ex 5.2 Solutions

Question - 1 : - Evaluate each of the following (1-19) :
sin45° sin30° + cos45° cos30°.

Answer - 1 : - sin 45° sin 30° + cos 45° cos 30°

Question - 2 : - sin60° cos30° + cos60° sin30°.

Answer - 2 : -


Question - 3 : - cos60° cos45° – sin60° sin45°.

Answer - 3 : -


Question - 4 : - sin230° + sin245° + sin260°+ sin290°.

Answer - 4 : -


Question - 5 : - cos230° + cos245° + cos260°+ cos290°.

Answer - 5 : -


Question - 6 : - tan230° + tan260° + tan245°.

Answer - 6 : -


Question - 7 : - 2sin230° – 3cos245° + tan260°.

Answer - 7 : -


Question - 8 : - sin230°cos24S° + 4tan230°+ (1/2) sin290° -2cos290°+ (1/24) cos20°.

Answer - 8 : -


Question - 9 : - 4 (sin4 60° + cos4 30°)– 3 (tan2 60° – tan2 45°) + 5cos2 45°

Answer - 9 : -


Question - 10 : - (cosecc2 45° sec2 30°)(sin2 30° + 4cot2 45° – sec2 60°).

Answer - 10 : -


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