Find the value of sin(90+30)

Why Cosine of 60 is Sine 30 #mathclass #brianmclogan #trig

8. In each case, given below, the valu angle A, where 0° SA < 90°. sin (90° - 3A). cosec 42° = 1 hi) cos (90° - A). sec 77° = 1

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⏩SOLVED:Use Figure 6 or Figure 8 to find the exact value of each…

Find the value of sin(90+30)

begin{array} { l l } { text { Find the value: } } & { ( a ) 2 sin 30 ^ { circ } + 3 sin 90 ^ { circ } + cos 0 ^ { circ } } { } & { ( b ) } & { frac { tan 60 ^ { circ } } { sin 60 ^ { circ } + cos 60 ^ { circ } } } end{array} )

By taking A = 90^@ and B = 30^@ , show that sin (A - B) = sin A cos B

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