Скачать или смотреть Full Tutorial of Transformation of Trigonometric Formula - Optional Math Class 10 Solutions

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Questions discussed:
1. sin25.cos15
2. cos4A.cos5A
3. 2sin42.sin22
4. cos7(theta) - cos5(theta)
5. sin25 - sin11
6. Prove sin(alpha) + sin(alpha + 120) + sin(alpha + 240) = 0
7. Prove cos(theta) + cos3(theta) + cos5(theta) + cos7(theta) = 4cos(theta).cos2(theta).cos4(theta)
8. Prove (sin2theta + sin3theta + sin4theta)/(cos2theta + cos3theta + cos4theta) = tan3(theta)
9. Prove sintheta.sin(pi/3 + theta).sin(pi/3 - theta) = sin3theta/4
10. Prove sin20.sin30.sin40.sin80 = sqrt3/16
11. cos^2(A) - sin^2(B) / sinAcosA + sinB.cosB = cot(A+B)
12. Prove cos^2(theta).sin^3(theta) = (2sintheta - sin5theta + sin3theta)/16
13. Prove 2cos(12pi/13).cos(4pi/13) - cos(10pi/13) - cos(8pi/13) = 0

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