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  • \(\sin^2x+\cos^2x\)

    =1

  • \(\sin2x=\)

    \(2\sin\left(x\right)\cos\left(x\right)\)

  • \(1+\tan^2x=\)

    \(\sec^2x\)

  • \(\cos2x=\)

    \(\cos^2x-\sin^2x\)

  • \(\sin\left(A+B\right)=\)

    \(\sin A\cos B+\cos A\sin B\)

  • \(\cos\left(A+B\right)=\)

    \(\cos A\cos B-\sin A\sin B\)

  • In second quadrant the sine of an angle is (positive/negative)?

    positive

  • In third quadrant, the sine of an angle is (positive/negative)?

    Negative

  • In fourth quadrant, the tangent of an angle is (positive/negative)?

    Negative

  • In third quadrant, the cotangent of an angle is (positive/negative)?

    Positive

  • \(1-2^{}\sin^2\left(50x\right)=\)

    \(\cos\left(100x\right)\)

  • \(1020^0\)in Radian is

    \(\frac{17\pi}{3}\)

  • \(\cos173^0\cos83^0+\sin173^0\sin83^0=\)

    Zero