See Mak, Ivan's answer to Rose's Secondary 4 A Maths question

Mak, Ivan's answer to Rose's Secondary 4 A Maths question.

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Hi Rose, after looking, try working it out. It helps!
Cheers, Ivan

Date Posted: 7 years ago

Comments 3 add a comment

Rose

7 years ago

Thank you so muchh! But how can it become 2 sinΦ cosΦ?

Mak, Ivan

7 years ago

Hi Rose, in the Topic Trigonometric Identities, sin2Φ = 2sinΦcosΦ is a double-angle formula. Take a look in your textbook or online for more information about double angle formulas. Some other DAF are: cos(2x) and tan(2x)

Rose

7 years ago

Ahh i see, thank you so much for helping me!