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ICSE Class 9 Answered

please give me the answer of attached question
question image
Asked by aryan2mumbai | 22 Oct, 2020, 08:22: AM
answered-by-expert Expert Answer
4cos2x - 3 = 0
cos2x = 3/4
cosx equals plus-or-minus fraction numerator square root of 3 over denominator 2 end fraction straight x equals cos to the power of negative 1 end exponent open parentheses plus-or-minus fraction numerator square root of 3 over denominator 2 end fraction close parentheses straight x equals 30 to the power of straight o comma space open parentheses 180 minus 30 close parentheses to the power of straight o equals 150 to the power of straight o As space straight x space is space acute Hence comma space straight x equals 30 to the power of straight o space and space cosx equals fraction numerator square root of 3 over denominator 2 end fraction
Answered by Renu Varma | 23 Oct, 2020, 10:15: AM

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