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Question

Solve: sin2600+cos2(3x90)=1

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Solution

To solve: sin260+cos2(3x9)=1

sin260+cos2(3x9)=1
cos2(3x9)=1sin260
cos2(3x9)=cos260 (Since, sin2θ+cos2θ=1)
3x9=60
3x=69
x=23

Hence, the value of x is 23

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